If you don't format your /home partition, then you should be ok. Everything in /home would stay intact, i.e. all your themes, icons, wallpapers etc. if they reside in your user based folders. If any of those new themes and such reside in your /usr/share/ they will be removed. Wine should be ok, but I can't say for sure since I very rarely use it myself.
But you should format your /, although I am unsure of your /boot, if you have a dual boot system running, but if not, then reformatting that won't hurt anything.
I wouldn't worry about being a pain, because you're not in the slightest. I actually enjoy helping others if I have the knowledge to do so.
It's perfectly OK to express an opinion, but refrain from foul and stupid language