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You'll still boot. I'd leave on any that might have to do with your video card, or sound card. On laptops, I'd also leave any touchpad programs running. Sounds like you already looked through them though. Some that aren't immediately necessary would be things like Adobe Acrobat quickstart, Microsoft Office startup, instant messenger programs, etc.

I'd say your biggest risk to disabling all of them might be a boot up to VGA video mode.

Somebody else mentioned the CMOS silent/fastboot type utilities which might be worth a check. However, if you're getting to a blue startup-type screen, you're probably beyond CMOS. From there you have programs in your "startup" folder, your msconfig startup tab, and your services that are set to automatic.

I'd be more careful about which services you might want to try disabling. If you boot up sometime and you notice your internet connection doesn't work, for example.