Most of the fixed blades I have ever owned were 1095, great steel.
I did oil them when I first started out, but promptly quit after it proved to be more of a mess than it was worth.
I still prefer carbon steel fixed blades, but nowadays I just wash them off with a bit of fresh water and clean them after I use them. I use my knives enough that they get resharpened before they lose any noticable edge anyway.
I don't have problems with rust, despite the fact that I give my knives quite a work out and reside in a corrosive environment, Florida. I take them into everything from swamps to estuaries. The 1095 would discolor with use, but no biggy, it's not really rust, and that was mostly from blood(I dispatch game with a knife).
I'm sure that all those fancy treatments help, but honestly, I have found I have a need for them. With the A2 I am using now, I haven't even had problems with discoloration.
Carbon steel is good steel. Just because stainless steels are more corrosion resistant doesn't mean your knife is going to turn into a pile of rust over night, or ever. Carbon steels have been used in cutlery for centuries with no serious problems. They've been used by everybody from mountain men to jungle natives.
In other words, do some basic maintainence, but don't obsess over it.