From my personal experience, i find PvE servers to be more PvE focused. With the nature of PvE servers, i wont get corpse camped or ganked and i'm more likely to find like minded players.
On PvP servers, there is more of a focus on PvP, ganking and corpse camping. There is still a lot of PvE going on, but more around PvP. I also found PvP servers to have a heavy concentration of people with massive ego's and horrible attitudes due to the competitive nature of PvP servers.
One thing that used to annoy me about PvP servers in WoW was trying to do daily quests, gathering crafting materials and just trying to chill and do something to progress my character, it would take 3 times as long because of the ganking and corpse camping and if i only had an hour to play, i may as well not bother logging on and then i asked my self why am i paying for a game i can't play.
But as always this is my opinion and other people experience things differently, while my experience may be in the minority, it was enough to put me off playing on PvP servers ever again.
Wait PvE servers more PvE focused?? No never!
Corpse camping almost never happens, 1) it takes to long 2) you can res back in the town if you wanted.
If you had a few issue it would take you 3 times longer as I have almost only ever played PvP, (well except for a short stint in AoC where we had a guild on the PvP server as well).
PvP server add a bit of extra spice, most times you can quest and no one will touch you, if you getting ganked be in a decent guild where people want to help you.
Most of the excuse above are typically from a PvE player, who went PvP tried to get a few kills got his ass kicked then whined about it.
PvP servers add something that you can never get on PvE serves, that extra bit of excitement, but more than that if/when we go through a real guild on guild war, as a group you become closer, have more fun and seem to be willing to share/help more.
PvP servers are not for everyone and no PvP player would ever begrudge a PvE player wanting to roll on a PvE server, but its funny how almost every pve player resents there being PvP servers, and you only need to go read the forums where this is being discussed to see the truth of it.
Me I'm not really fussed as long as I can get a bit of open world PvP I'm happy.
As a guild we stick together you getting ganked and we come arunning! well unless you BW snitch ..then not

.
I will add one thing I am not the best PvP'er average at best, but what I do have is a guild that will back me up... and thats all you need