I like EE and wouldn't want to play without it any more. Yes, EE makes it somewhat easy to get diamonds. But quite a few mods use a lot of them. Buildcraft and its addons in particular. The normal way to get diamonds can get really frustrating - I once spent three real-time days mining without finding a single one. So I'm thankful for EE. EE 6.22 is way less overpowered than earlier versions, at least early in the game.
Also you will eventually get to the point where you don't have to mine anymore, but I've got mining tunnels across in an area of 128x256 at level 10, completely mining it out, before I get to that point.