The funny thing is, I do use features exclusive to XP Pro. The ones I use the most are Remote Desktop Connection (Terminal Services), logging into a domain, access control, roaming user profiles, Remote Installation Service, and Administrative Tools (can't belive XP Home doesn't have this) to name a few.
Before anyone says that XP Home has Remote Desktop Connection, it doesn't; it has the client software to connect to an RDC server. I know I probably won't be using my laptop as a server to serve an RDC connection too often, but that doesn't take away from the fact that I use all the other features (and need to use most of them). I'm not trying to convince anyone that XP Pro is better, I'm just saying it's perfect for my needs.