a PVP realm for more than a year

I have very little PVP experience on any of my toons, with one notable exception. I was on Arthas, a PVP realm for more than a year.
World of Warcraft Gold
The reason for having to balance the gear so wearing one set in the opposite environment isn't a total handicap is the existence of PVP realms and World PVP.

You shouldn't be a free HK because you are out questing in your PVE gear. A PVP geared player should have the gear advantage out in the world, but not the ROFL-stomp you advise.

On the flip-side, how is a PVPer suppose to do any meaningful PVE? You can't get PVE gear without doing PVE, and you suggest that they not be able to contribute in the slightest because of getting started in PVP gear.