Welcome aboard guys.
I left WB a while ago, dont miss it at all. You will need to make a few adjustments though, and the head moving under high G's is one. But like others mentioned, I don't notice it anymore, and you won't either after a very short while.
You will also have to get used to frequent updates and improvements, they do come along alot quicker here. It keeps the game more interesting.
Also, try to get used to the idea of a company that has decent support, and one that doesnt have the webpage address changing every year or two.
You may be amused by using new features about a year before the competiton rolls them out, stuff like steerable CV groups, M16 half track, tanks, etc.
The flight modeling is differant, and it will be a big adjustment, but once you get used to it, you wouldnt go back to the old one for anything. Take my word on that.
One of the reasons I left WB after many years was the ever changing, ever getting hosed up gunnery and damage modeling. AH guns are quite lethal. I suggest not dwelling on that, rather concentrate on not letting someone get a shot at you, its brain processing time better spent.
The WB community was a great group, but AH has many fine players too.
Dago