I think that one of the great things about the AmigaOS is that it IS so configurable. One of its strong points is that you can adjust things to be more the way you are comfortable with. If you happen to tend to like some things the way Windows does them, there's no foul in that, and you have every right to do it that way.
But realize that some of the things you mention aren't necessarily Windows-specific mimicing. You'll find a screensaver photo rotator for any OS, not just Windows. Unix systems has window resize on any edge. I use my mouse scrollwheel under Linux quite a bit...
I myself have done things to make it somewhat unix-like, enabling star-wildcards, aliasing unix command names to amiga shell commands, etc. I'm trying to install an X-window server/client on my Amiga, use openSSH, have Cygwin on my Windows PC, and wish there was X-windows, openssh, and subversion (successor to CVS) for OS4. I don't see why I should feel guilty about this.
Think about it this way. Would you rather have some neat feature running in AmigaOS that isn't put there by the AmigaOS install CD, or would you rather trade your "guilt" for "jealousy" of some other OS that has what you want your Amiga to do? Don't worry. Be happy.
