I would not go so far as to state, let alone assume, that people are fine with it just because they use it. Neither would i assume that "quicker access" is the main selling point for most participants. For alot of people, there is no real alternative to getting certain rewards, Valor, for example. Good luck getting far there without a raiding guild if you decide to boycott the LFD/LFR systems.
The main negative point for the system in my eyes is not even brought up. The death of the "World". People dont venture outside of major cities in any great extent other than to farm materials or be the designated summoner for a raid. Pre-wotlk, the world was alive with people. The act of forcing a player to move to the instance they want to join does not prevent "que-like" systems(the stones, remember?). Try visting, say, The Burning Steppes and tell me if its a place where you can find someone in its designated level range. You cant, because Blizzard had become like Apple. Who with each new ipod/iphone killed off its previous products. This lesson has been adopted by the WoW devs, who, in their neverending hunt for band-aids to the underlying major issues, will accept any casualty aslong as it gets them out of losing more than x% of subscribers.
Even leveling with these new systems, or the use of heirlooms, will make you "out-of-sync" with quest progression pre-80. Try making a worgen with all looms and tell me what the color of the quests are after an hour. Band-aids. Implementing a proper daoc /level system would be much better, and wouldnt prevent people from experiencing the content the first time. But i am offtopic. This is not easy to fix, but we are many who feels that the devs arent even trying. Alot of us has offered to help, pro-bono. What do we get? Auto-replies.
In my personal opinion, the overabundance of players that make my skin crawl make me shy away from que-ing without a majority of guildees/friends. It's not simply poorly skilled players(we were all once) but almost always bad attitude and insults flying if someone is not 100% satisfied. Report them, you're told. But in the end, they just part of the endless list of faceless randoms, so why bother?
But the door swings both ways here, positive experiences have no way of leading to permanent ties. This could potentially be adressed by battletags.
This reminds me of Peter Molyneux hypes. There is no need to not be realistic about the system or secretive, about why it is implemented. It is not designed for WoW, and will, like the Two-Toed Sandals, work fine but never quite fit.