I use a "dry" lube on my mountain bike, so after every ride, I brush off the dirt and reapply the lube. This process takes a few minutes and is very easy.

I also have a SRAM chain with Powerlink. You can disassemble and assemble the Powerlink feature with two fingers in a few seconds. Every now and then (more then than now), I do a good soaking in Simple Green.

I have yet to adopt this, but my ride partners have two chains, one on the bike, and one that's been cleaned well, and these chains are rotated at some interval, essentially, there is always a fresh one ready to use. With the Powerlink, it takes a couple of minutes to install a chain.