Due to how incredibly easy it is to get Heirlooms now, and even more heirloom slots (ring, neck), just having a few Heirloom decked out players in an leveling dungeon you could just sneeze at it and win. I don't fret any dungeon before max level now, they are just a nice quick boost of XP between leveling.
As for PVP, I spent a lot of money getting off my old PVP server. I started on a PVP server back in vanilla, specifically Tichondrius, and played on that server all the way up to MoP as my main Horde server. During WOTLK though, I made Alliance characters on Ghostlands at the request of my wife, which was PVE, and I found myself enjoying the freedom of not getting ganked up the ass while trying to relax. It got so bad, that I just never wanted to play on my Horde server anymore half way through MoP, leaving them stagnant, so I decided to bite the bullet and transferred all of them to Wyrmrest Accord, a PVE RP server. I once again play them just as much as my Alliance characters.