Last time i "seriously" raided was in WotLK when we had a group with few guys i knew from irl + internet friends and few randoms which we recruited. Completed Naxxramas, ToGC, and wiped few times on Lich King. I can't say i really enjoyed it. Only times it felt good was when i got loot. I wanted those bosses to die just to get some loot. When some underperforming idiot recruit got loot, i just got frustrated. Lower level difficulty raiding is never really that hard, we had players who instead of running away from ToGC yeti boss charge, run intentionally straight into it, and still managed to clear the raid.
I started to run LFR on ToT. Now i've run HFC LFR only 5 times for legendary meh ring and i definitely don't want more of it. Hopefully in legion even casual baddies like me are not "forced" to run raids in any form. But knowing blizzard, i'm sure that you simply can't "finish" your artifact without raiding.
TL;DR: raiding is not for everyone and blizzard will never understand it.