The best weddings I have been to have been small low budget affairs, that may say more about me than any one else though.
At one wedding of a friend she assigned 'jobs' to people, all done very informally before the day, so my 'job' was to ensure the mother of the groom had someone to talk to ie me, and someone to make sure she had a drink, got some food - again me.
It actually worked really well, there was no standing around for hours waiting for photos because I was making sure my friend's future MIL was OK.
Agree with having cups of tea with the buffet and if possible a quieter room where older guests (or ones who want a break) can get away from the music.
Ok, here's a biggie. Evening guests. There are people I want at the party who probably wouldn't come to the day anyway. Do I have all day guests and evening guests?
I think that depends on budget and who is on the 'evening only' list. To me evening only guests are work colleagues not friends and family, or possibly teenagers who can turn up with a couple of friends having not sat through the speeches.
When a friend got married she was still at uni, so a couple of us who are closer went to the full things but her entire cohort were invited tot he evening do - they borrowed the NUS mini bus!
Remember you do not have to have anything other than the vows and 2 witnesses.
If you don't want speeches then don't have them, ditto first dance, children, etc.