I don't really know which way to vote, as, to answer your question directly, No, YANBU to dislike - or even hate - something that lots of other people like.
However
For your reasonings, and most of your responses since, YABU.
I've been to many, many weddings over 40+ years, and overwhelmingly, the food has been lovely.
I've never been to a wedding that is impossible to get to (well, obviously......)
I've never been to a wedding where it is impossible to leave. People leave weddings at different times, for all sorts of reasons.
(I do agree about chair covers)
I enjoy a dance. My dh hates it. He has never felt any pressure to dance (except for a slow dance at our own wedding).
Hangovers are not inevitable. You decide how much you are going to drink, spread over how long, what you choose to drink, and how much water you drink alongside it. Indeed, you don't have to have any alcohol at all. That is up to you, not the fault of "a big wedding"
Weddings don't have to be 'expensive'. It is up to you if you choose to stay over, or if you choose to drink lots, or if you choose to buy new clothes etc etc.
All of those ^ are just from the op.
If you don't like them, then don't go.
Siblings apart, there is no obligation to go to anyone's wedding. If you are being this miserable about every part of every wedding you go to, people would probably prefer that you don't go.