WoW player since vanilla reporting in and corroborating everything you say here. This idea that the LFG tool introduced in Wrath suddenly and irreversibly destroyed WoW's shining paragon of community is ridiculous. The only thing the LFG tool did was allow people to do content in their own time, at their pace, using an automated system that afforded convenience, security, and accountability. Not only that but the people who want to form groups the usual way are given that choice.
I read and agree with everything in your post (good read by the way, well spoken) but this is the part I personally agree with the most and want to see implemented into this game.