The performance benefits are not quite so noticeable if you're only riding a couple miles at a time. I ride clipless to and from school with a change of shoes (or just walk around barefoot) and I only ride 4 or 5 miles to campus. But the main reason for this is because my cycling shoes dry out faster, I have clipless pedals on my bike most of the time anyways for the longer rides and it just saves effort from changing pedals every other day, and lastly I unfortunately run brakeless, and rode too many miles brakeless with clipless so that I no longer feel comfortable with just clips and doubles.