Gents, you should start a "Wedding planning...for guys" thread. I could tell you some stuff.
My wifey and I will celebrate our 18th anniversary in June. There are two things you need to remember:
1. It's just one day. In the grand scheme of things, it doesn't really matter much.
2. If mama ain't happy, ain't nobody happy. I'm talking about your fiancée. Your mothers are your fathers' problems.
Your Dad has been married to your Mom a long time. He gets it.
I love that I can now relate to my Dad on an adult level and we can give each other advice. It's pretty awesome.
3. Women are crazy. I hope you both picked a woman whose crazy is at a level you are comfortable with. (not that men don't have our quirks...but women are crazy)
Smart.
For some reason, the wedding is the "one day every little girl dreams about". I don't get it, but I'm a guy. Your mom and her mom are living vicariously through this experience. In some ways, you need to put your foot down; in others, just roll with the punches. Remember, it's just one day.
The best parts of it will be realized YEARS later. You're starting to learn the art of compromise.
Honestly, we don't even look at our wedding photos all that much. We got married in 1997, in the infancy of digital photography, and all of ours was negatives and prints. You want several "wallhanger" portraits because you'll be looking at them for the next 50+ years. My favorites were the one of just us, and one of both of our families. The rest don't matter. Even the ones with the wedding party. I was moderately (but not severely) inebriated at my brother's wedding and climbed on the roof of the reception hall with a DSLR and got a very cool group photo of everyone out on the lawn...it was a wallhanger. :)
The very best weddings I have been to were the week-long parties where all your closest friends and the family members you like (ideally including your fathers) get together and hang out and explore the area. It's not like a weeklong bender, but liquid refreshments can be involved for those inclined. The wedding ends up being the cap for an amazing week. We did a float trip for my brother's bachelor party and then ran 3 more rivers over the next week, hit a rodeo, small town parade, and several picnics. Another friend's pre-wedding festivities included a float trip, a gun range, an overnight 4-wheeling trip, and more guns.
The least memorable ones were the stuffy fancy ones with place settings and rigid reception schedules.
Be yourselves. Have a wedding and reception that fits the two of you. This is not the time to pretend to play dress-up if you're not that kind of people. Or, if you are, do it.
Oh yeah, and if you're not already living together, be VERY careful of how things are done the first week you cohabit. The side of the bed you sleep on and which way the toilet paper is rolled will be locked in stone for the next 50+ years. No, really.
This would be a great role of the best man and maid of honor, especially if they're great friends of yours and know your wishes without having to ask...even better if the two of them get along and could function as a team. This used to be part of their official roles, but were supplanted by "wedding planners".
Oh, and challenge the maid/matron of honor to put some thought into their toasts, instead of the yucky gushing stereotypical "Oh, she's my bestest friend and I love her and Joe makes her so happy and <tears> I'm so happy for her!"...while the best man has everyone in stitches, including grandma.
Oh, and another thing for the best man, aside from hitting on the bridesmaids. You are going to set your drink down to visit with Aunt Betty or to dance with your flower girls...and one of the caterers/family members/wait staff is going to toss it. Make sure the best man hands you a fresh one...somebody paid for an open bar, you may as well enjoy it a bit. At the same time, make sure he also alternately hands you a bottle of water. You don't want to pass out drunk on your wedding night!