I've played and raiding since vanilla too. I'd agree that a lot of people put on their rose colored glasses when they think farther back in the game. With that in mind I had the most fun raiding in BC, having a tight group of friends that played very well together was a huge part of that.
I raided up until earlier Cata tiers, then we had a baby which changes things dramatically for most people. Took a break, came back, that tight group of players was gone, I wasn't in a raiding guild, etc.
I was still playing and enjoying the game, when LFR was released I was able to at least see the content when it was current, which I enjoy. I know it isn't the same experience I had in the past working closely with people and being so excited when we downed a new boss, but I don't expect it to be either. Now I have a more casual schedule (note, it doesn't mean "casuals" don't know how to play the game) and like that I can log in and get into an LFR group and be able to see the current content without a whole lot of drama involved on my schedule.
If LFR is ruining your gaming experience it is only because you are letting that happen. Either don't run it or stop being so upset that other people get to see the content in a toned down manner. Pick either option and you can go back to your same old raiding that you had before.