Yes, revising requires plenty of new words, but I wonder if revising requires a different set of muscles than writing a first draft. When revising, there's a lot of focused surgical strikes. When writing a rough draft there's a flow, a tapping of the muse, a more inspired form of writing.
It's weird, when I finally move onto the next novel, I feel unshackled and am able to express my new MC in completely new ways. Upon starting each new novel, my crit group is really struck by my improvement. Sure, that improvement might've come partly by way of revising the previous novel for the past 2.5 years, but I wonder if I'd see more benefit if I worked at least a bit of each day on new drafts.
Who knows what will work for you? You're kicking around the idea of working on new stuff whilst editing the old. Maybe that would work. You don't know until you try.
Consider the time frame, say two years. What is your goal in that time frame? To write a novel, edit the novel, complete the novel? Or is it to start a novel, start another novel, start another novel and meanwhile, edit a rough draft? I would wonder about focus and practicality, but that's just me.
In my experience, writing a first draft can be exhiliarating. Heady. But editing is where I am most satisfied with my work because I'm molding something with potential into something real. It takes a lot of concentration to do that and I find myself really involved with the story, the characters. As I edit I'm breathing life into my work. Hopefully, not sucking the life out of myself in the process
because it can be intense sometimes but in the end, that effort is worth it.
To me.
Of course YMMV, Procrastinista. I do wonder if a little of bit of your name might be telling you something, though.