Being a CFI, you usually won't have the extra money to grab those 100 dollar hamburgers and you don't get paid for that time on the ground.

I have done both pipeline patrol and flight instructing to build time. Both offered valuable experience, each in it's own way. I've also flown divers. I'd have to say that's the least valuable experience of the 3 types of flying I've done.

Flight instructing isn't for everyone, but the industry almost forces you to do it in order to get the flight times you need to move on.