well if you get 8.1 and totally ignore the tiles like I do, then it is very similar to 7, just with an annoying way to get to the control panel.
I use 7 on my work laptop and 8.1 on my PC so its easy for me to spot the main differences between the two.
Annoying how though? The only difference between 7 and 8.1 is that in 8.1 you right click on the "starter" button before you can left click on control panel link instead of left clicking in 7 on the starter button. That is the only difference with the control panel. The only annoying thing is shutting down in 8.1 which takes more steps if you run in normal windows mode.
Anyway Windows 8 is alot like 7 now with the tiles no longer being the default so upgrading to 8.1 is no longer a travesty as it was at release. I do believe Microsoft is unwilling to understand their audience. Seriously, why would a business even want to use tiles let alone gamers? It never made any sense.