Of course, it has a cost in time, but the straight razor itself can be faster than other razors because the blade is longer and it doesn't clog. I'm not sure if it's a net win, but I'm sure it's close.
To me straight razors represent community, whereas cartridge/disposables represent isolation, loneliness and obviously disposability. The people who are too afraid to use a straight razor, have to go to a barber to experience it. That's fantastic as it creates more social elements to this routine aspect of life.
With a hollow-ground razor, the most popular style, the blade is held flat against the strop or hone and the width of the spine holds the edge at the proper angle. This makes serious mis-sharpening less likely. It probably does help to have some knife sharpening experience though.
My method using a bench strop and diamond compound is not traditional, but I've found that as long as there's no actual damage to the edge, it always restores proper sharpness while more traditional methods with a hanging strop require sharpening on a stone every few months.
I use a oneblade now, and ignore what it costs. It’s fast, convenient, safe, and has never once cut me.
I tend to just keep my facial hair trimmed. I try not to use a blade because it irritates my neck. I do Brazilian Jiu-Jitsu, so I'm sure the grappling contributes to the irritation, which is partially why I've all but given up on shaving with any form of blade.
Like DE, it takes some practice, and in addition, requires maintenance. I use a leather strop on a rigid surface with 0.5 micron diamond paste, but the traditional method is a hanging strop and occasional honing on stones.
It's not a hobby for me, but it is a considerably more comfortable shave than cartridges. On the rare occasions I've used cartridges after getting used to the straight, I've noticed irritation, which I hadn't when I was used to cartridges.