WotLK is widely regarded as the best expansion. You sound like one of the vanilla hipsters. I played Vanilla, too. It was awesome. It wasn't anywhere close to as awesome as the game had grown to be by WotLK.
BTW, this is reflected not only by the bulk of online polls, but also in subscription rates. It continued to grow after the release of WotLK and subscription peaked and held with that expansion (over 12 million active subscriptions): not Vanilla, not BC. It wasn't until after Cataclysm had been out for half a year that the exodus began. The shit really hit the fan with MoP. They lost several million players in the matter of a few months with that expansion.
Point and click, ROFL? Maybe the way you play it, sweetheart. I have to believe that you're trolling, Jimmy.
Top PvPers carry 40+ hotkeys and use every single one in the span of an arena battle. They will fire these off at every single GCD (I think the floor was ~1s when I still played) in addition to firing off all the other abilities that aren't on the GCD. Additionally, this isn't counting macros programmed and assigned to certain keys or mouse buttons. So you're basically using every button on the keyboard your left hand can cover in addition to three modifier buttons (CTR, ALT, SHIFT) to be able to execute all these keys. Typically you're using a gaming mouse with every single one of its buttons used, too. I think the top WoWers are playing north of 150-200 keystrokes per minute. Not quite Starcraft in terms of volume, but the per keystroke decisions tend to be more consequential.
WoW is gaming at its most complex and skill-intensive. It's one of the very few Tier 1 games in that aspect.