so lemme think, you say WOW, SC helps you improve thinking...SC helps basically with agility, to be fast and precise and to plant a strategy deep in your soul and it helps to understand "more" with seeing less "evidence"..for example in SC if ur playing for years hardcore, you dont even need to look at the actual screen sometimes, you just take a milisecond look to the minimap and you understand whats going to happen soon, this could help in poker but not always, it makes you play like a robot..so..i guess its only useful for mass multitabling..
as for WoW...hmm..doubt it can help u in poker..i played wc2 wc3 sc bw wow and many others before i came to play poker...although if i'd have money i'd be still playing wow prolly..
if something could help poker skills, i definitely say chess..the ultimate game that improves ur intellect.