From my experiences ME basically ran and looked the same as 98SE but was buggy as hell and also slowed your PC down.

What actually did ME add significantly over 98SE? I'm trying to think of it and can't
I guess USB started to get built in around the time of ME and that's about it?

I just wish people would upgrade to something better. I know people that are still using Win95 which is fine if the computer does what they want. It's just that nobody and this includes Microsoft supports it anymore and finding patches for bugs/security holes is hard!