How should I dry my hair?

So first I should tell you my hair type I guess. I have straight hair with a lot of natural volume. unless I sleep on it wet, then It gets wavy (not cute wavy) and a bit frizzy. My hair takes forever to dry. My hairdresser friend told me that this means I have porous hair, and that water is getting trapped i my hair. I can see it, but after researching it, I saw that porous hair is much more common in curly, hair, which I don't have. Anyway, She recommended pillowproof for me. Which did somewhat help. Right now my routine is after a shower, squeeze out the excess water, towel dry with a microfiber towel for 15 minutes, spray some pillowproof and it's a 10 leave in with keratin in my hair and wait. the wait is 2 hours on a good day, 3 ish on a slow day. slow days are more common though. I know pillowproof will work better if i blow-dry my hair, but I like how healthy my hair looks now. Plus, hairdryers have so much energy! Someone recommended only blow-drying my roots to get the hard part out of the way. but I don't know. should I just give into a hairdryer? Or do something else?