Yeah, I thought it might be that way for me, but it wasn't. I generally have 3-5 desktops full of stuff. Usually 2-3 IM clients, Chrome and Safari open. Usually a couple connections to various servers or client computers, either locally or via VPN's into remote offices.
What I noticed is a lot of app switching or even opening some new thing I was starting to get perhaps a dozen beachballs a day and just general slowness switching between applications. I'm still running on 4GB, so one would think it's memory but I have zero pageouts. So memory is not my problem. If I need to start running VM's locally again I will need to upgrade to 8GB.
Anyway I used carbon copy clone and pasted my HDD image to an OWC SSD drive. It's been fine since then. So I actually see improvement in day-to-day tasks too, not just on boot up speeds. I also find it a lot less painful to reboot into Windows 7 for my Total War (game) fix when I'm home at night.