For all you know they are having a very small wedding and REception, with a small lunch with immediate family, and then having a party with all their friends and wider family in the evening.
I don't agree that the B&G are knackered and not bothered by the evening do - that is often where they actually get to have fin with their friends instead of uncles and friends of their parents'.
Weddings take many different forms now, according to cost, how to manage extended families, a small lunch to avoid having to manage a 'top table' arrangement with divorced parents etc....and most of all, massive expense.
Evening invites make you feel a bit of a last minute thought but maybe that's just me Well, you and others who seem to take things personally. I know no one in RL who reacts in this huffed up way.
An hour each way, with the ability to stay at relatives is no problem at all, for a great party if you would have fun. Surely you know lots of other friends who will be going?
Anyway, go if you want, not if you don't - but just as you have taken it badly that you were not invited to the day reception, don't be surprised if your friend is not impressed if you can't be arsed to go to her wedding celebration party.
Maybe come back to the decision when you are not in a bad mood?