Pfffff... I have a boot SSD for win8, but to say that a normal platter harddrive is slow? Man.... we sure take speed for granted, my work OS is on an HDD (2.5" !!), startup time may be slow, after that, I bet it flies compared to most of the computers here (An SSD is not an excuse to not properly maintain an OS instalation)
Why do you think your HDD flies to compared to SSD installations? What exactly do you do to maintain on an OS installation to keep it fast for an SSD? The only thing I can think is potentially not having crapware installed (and even then it really isn't an issue for access to the disk -- more on that below). On an HDD you actually have to do defragmentation and making sure you don't have a ton of things running that are doing concurrent disk accesses.
Food for thought: take two brand new installations of Windows - one with an SSD and one with an HDD. Throw 16GBs of cloud synced storage on both (~10,000-20,000 files). On boot, the cloud storage SW will iterate through the files and check to make sure everything is up-to-date. On the HDD installation, it will take 3-5 minutes to verify all of the files and while that is occurring it will be impossible to do almost anything on the computer (without huge lags and slowdown) because the hdd head is currently rapidly reading other things for verification and does really poorly with rapid concurrent accesses. On the SSD installation, it will take 30-45 seconds and even while the files are being scanned everything will still run normally because you have very high concurrent access speeds.