All of the servers we use are in a flavour of linux, so i've always had a day-to-day use of it.
Although some windows ide's are really good (looking at nusphere PHPeD) and allow file transfer via sftp with RSA key authentication, trying to mount a linux drive in windows is slow at the best of times (things like sftpdrive)
I'm on ubuntu 9.10 now, and have customised gnome to look/act alot like mac os (as there GUI is much more user friendly then basic gnome. With this I can mount all my servers as folders and get the best project management and code completion (as in most ide's code completion doesn't work on remote files)
Also having the ability to use SCP + rsync to transfer files is much easier/quicker then S/FTP.
I know linux commands are available to windows through sygwin - but that's just cheating
