Really. Nothing makes more difference to your skin than exfoliation.
I was lucky as a teenager and always had reasonably good skin. As a result, I was fairly lazy and didn't really make an effort. It wasn't until I was older that I tried some products, and realised that I could have more than reasonably good skin with just a tiny bit of effort once a week. Exfoliating your face is great because it makes you look and feel fresher, whether you wear makeup regularly or not. It gets off grime and rubbish that you wouldn't even realise was there if you only ever used cleanser.
Exfoliating your legs is an absolute must if you shave or ever self-tan. Trust me on this one.
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