Eh, I got over that in grad school, when I was taking two and sometimes three writing classes at the same time, and was expected to turn in pages for multiple projects each week on an ongoing basis.

My plan isn't to necessarily work on all four every day, just that I have four open projects to work on at any given time. I either do screenwriting with a specific program - which means no work computers - or handwritten - which means I can't when I'm working at the circulation desk. So, those are the times to work on my novel. And for me, if I'm not feeling a specific story/scene at any given time, it's nice to have something else to work on rather than just blow the day off. Which I've done before.

So yeah, different techniques and styles, definitely. One thing I'm pushing myself to do more regularly is to write like a professional, which means to just sit down and write dammit, write it better the first time, write it fast!, etc. I'm trying to be less prissy about "I can only write when I'm in this specific place for a set period of uninterrupted time, lalala," that kind of thing. It's one of the implicit goals in the above.