Newly-converted straight-razor shaver here.
I stopped using disposable (cartridge or otherwise) razors five years ago and never looked back. I still use my 70-year-old safety razor when I'm too rushed; I'm afraid I'll take my nose off if I rush with a straight razor.
I'm also in it for the green, though a stronger pull is the old-fashioned nature of it. It's also relaxing while being very focusing
. You have to focus to use a straight razor if you don't want to have bits of face in the sink. This is useful first thing in the AM; helps one get one's day into focus before hitting the office.
Also, don't try this after three cups of coffee.