My current high AC character has often deliberately provoked the AoO for other characters to withdraw to safety. Also one time he took an AoO on a mook thereby allowing the horde to flow past him to the 2nd liners.
As a result, I think that there can be an overinflated fear of AoO and also just because you can doesn't mean you should take it. All in all, the AoO part of the game can be pretty fun indeed.