The only thing competitive PvP wise at max level is full premade vs premade WSG's which from what I can tell on the forums doesn't happen much and when it does many butts are hurt. Right now people have to make the choice of having fun, competitive games, or chasing R14. Guess which one wins out 99% of the time.
Raiding was pretty competitive, but won't be with all boss strats and what not figured out 10 years ago until at least AQ. The real raiding competition comes with Naxx and that will also be when PvP competition dies when only 1 or 2 guilds can gear in T3.
Anywho, done it before and I know exactly how it will go patch by patch. You grind hard for R13-14 then 2.5 gear comes out and makes majority of PvP gear worthless due to that gear covering most specs that current T1-T2 does not while having superior stats to PvP gear, then it becomes raid to PvP for more than just trinkets and weapons. Naxx comes out and if you aren't in a top tier hardcore raiding guild have fun, cause I remember what Naxx geared premades were like.
Quick reminder of what vanilla PvP will become for the top players: https://www.youtube.com/watch?v=oKQNJL5IL2s If you complain that running into the same 2-3 premades sucks now, just wait.
Or, you can stick with twinking where you can reach BiS gear(which for the most part is just a few stats over near BiS gear) cap with a few hundred gold or be competitive with BiS players for like 20-30g and nearly no time invested beyond leveling. Then you just login when you wanna have fun. That said, 10-19 sucks. Try 20-29 or 40-49.