I think it is the manufacturers of slow speed grinders that tell you that slow spedd grinders are the essential sharpening tool, but then they would wouldn't they?
Have a look at my youtube channel, thebowlerhattedturner, and you will see half a dozen videos of my sharpening system in use. No need for all these expensive gimmicky grinders. Learn how to use a bench grinder correctly and save yourself a fortune.
I would agree with you to some extent, there is no disputing the sharpness achievable on a Tormek, and I fell into that trap watching it in demo mode at a show. Took me a while to realise that they were so sharp one run along the toolrest not only took the razor edge off but also "sort of" snapped it off leaving them less sharp than a tool sharpened to sharp but strong (sort of 120 grit sharpness if that makes sense), however being lots of money into the pit it took a while before I was ready to admit I made the wrong choice... No doubt about it for bench chisels, kitchen knives and the like the edge achievable on the Tormek is hard to beat, but for woodturning it is not the sort of edge you need.
Whatever method gets you off the sharpener and back on the lathe quickly and efficiently is the right one for you.
However, shiny new tools have an irresistible lure when you have money in your pocket!