I haven't had my Hotplate for that long but I have found it very useful for a couple of different things:
Taming a Master volume amp so you can use it in the bedroom. I do this a lot where I set the HotPlate to -8db and then I can get the master volume on the amp up to about 9:30 or 10:00. Just enough so the power tubes are working a bit. You can turn your amp up as much as you want to but there is a tone loss factor the more you attenuate it.
I also use it as a line out to record silently into my Toneport. If you do a search for Hal9000 on this forum he's got some audio samples of this type of setup.
That's what I want, just to get the power tubes working a bit! As it is, I'm barely using the power tubes when bedroom jamming... I don't need absolute saturation, just a little more oomph w/o killing my ears, roommates, neighbors, or small animals