YABU because I love a good wedding - I don't get the angst on here - a nice meal with friends and loved ones, drinking and dancing all together, someone else picking up the bulk of the costs, it's a great day/night out!
If it doesn't suit, because you can't get there, would have to stay over and can't afford it, can't get childcare, then don't go, there's very few weddings of the 30+ i've been to that were ones I couldn't miss, in fact, I think only DBIL is the only one where it would have been a problem to decline. (and when my DB finally gets round to arranging his, I suppose missing his would be a problem).
The issue here is that most people seem to think the event is about them - that if it's not been planned to suit them, then it's all sorts of wrong. Weddings are about the couple getting married. If their parents/extended family are paying, then it's also about them, but generally, it's just a day for the happy couple. Beyond that, you should be delighted to matter enough to them to be invited, but not think that making it perfect for you should be the priority of the couple - you are just a guest!
Now, a lot of the bridezilla angst usually strikes me as because you get people who've never arranged an 'event' previously suddenly having to do their own. Most people can't afford wedding planners, but it is a full time job, trying to do it on a budget, fitting around another full time job when you don't really know what you are doing is hard and most will make mistakes/get stressed.