I've used a hose on my mtb for 20 plus years with no problems. Plenty of shops do the same. You just cannot use ANY pressure at hubs, bottoms brackets, seat collars, etc. so the hose at car washes are a HUGE no-no. I will do this to a road bike only when the entire bike has been soaked with salty fog which is corrosive, otherwise I tend to wipe them down with damp rags and Bike Lust.

I know some folks do it in their shower.

One thing that article doesn't mention and is very important. Do not get degreaser on your disk brake rotors or pads. You'll can gum up the pads with residue. Just clean the rotors with alcohol.