What kind of high horse are you talking about. I think the argument “I dont like new features because I dont like retail” is simply prove, that players dont want to play old expansions, but new ones in vanilla style.
The main difference of opinion in this whole RDF discussion is that some people, me included, want to play wotlk and others, you included, want to play a different game, because you dont like wotlk.
Any other argument is secondary compared to that. RDF itself isnt the problem, but its blamed for future changes that turned the game into what is retail today. Wotlk itself, with RDF, was and is (on private servers) the most desired expansion with its original design. Thats not a high horse, its a fact.
Of course players will queue with RDF and not travel to the dungeons, but to be fair, only 2 players fly there while afk going to the toilet and the other 3 get ported, like with RDF. Besides crossrealm, RDF is not any more social than the new tool they implement on wotlk beta right now.
Since no players get excluded by the RDF tool, there are new and bad geared players too, so most geared players will still go premade the old fashioned way to avoid to run with these kind of players and to have faster and smoother runs.
While not using the instant resurrect button of your example would have no upside, forming premade groups still has massive advantages over solo queueing RDF. You dont have to wait as DPS, you have faster runs, you have smoother runs, you avoid class stacking, you dont risk having a ninja or someone who might leave. Therefore your comparison with the insta-res proves you havent really thought about the subject, since it its only applicable to the teleport to the dungeon, not the group forming itself, which is the main aspect of RDF.
Your second example confuses me even more. You are correct about the first part, that players regardless of gear/skill are included, but there is no difference in the social aspect if we compare RDF and beta LFG-tool. With RDF you queue up and accept your invite. With the beta LFG-tool you list yourself and get a group invite by someone making the group manually. Besides the group-leader there is literally no difference when it comes to social interaction or chat usage. Therefore I dont think the new group tool does require more social skills than the RDF, since they both dont require any. Even today on mega servers, whispering 100player “inv [class]” and getting an invite 30 min later, is comparable to RDF when it comes to social experience.
The raid finder is another thing, because guilds, as social communities, are usually focused on doing raids together, not primarily dungeons. Dungeons are entry level content that players do, to get raid ready and then look for a fitting guild to raid with. While LFR is a debatable feature because of its influence on players being able to see the raid content without the need to join guilds/organized groups, I dont really care, since I wont play cataclysm anyway, because I dont like cata class design.