With ANY new software release there are going to be changes. I guarentee that you can Vista look and feel identical to Windows XP. Even most applications that don't run on Vista can run when using the compatability mode.
I suppose I should start I hate Adobe Photoshop CS3 thread because they changed how RAW works, and stuff. Or how some of my filters don't work with CS3. yadda yadda...
I remember these same threads when Windows 95 came out, windows 2000, and yes... Everyone hated XP at one point too. Now everyone will hate Vista until VistaX comes out, and then we will all talk about how great the good ole Vista days were....