Re: How important is having multiple channels to you?
Many reasons.
Just don't like 'em. Too complicated. Often, they have one channel I like, and the other is "meh".
They tie you down too much into that "can't get my tone(s) unless I'm playing my amp" thing.
I prefer a good-sounding single-channel amp to get me in the ball park - a Marshall with a moderate level of grind for rock, a Fender for more rootsy or countryish stuff (like church) with just s bit of hair on it. Big room, use a big amp. Small room, take a small amp. Either way, the amp marks the center point of the gain/dirt range, then I get my variety from my hands, guitar, and pedalboard. If I need it cleaner, I roll back my guitar volume. For heavy overdrive, I use a stompbox.
I'd hate to get wedded to something like a JVM, and rely on all four channels, then have a small gig that only needs a Princeton. "I can't play a Princeton! It doesn't have my four channels!"
Also, I don't like the big step-changes in tone between channels: clean tone, press footswitch, WHAP! - dirty tone. Controlling overdrive levels with the guitar volume gives infinite shades in between, rather than just WHAP. Channel switchers are almost like a compositional tool for pop-numetal- just mark the footswitch verse/chorus. (Sorry, but I heard ''Superman" on my kid's clock radio this morning - that's a prime example of what I'm talking about.)