I admit when I started playing, I got darkvision wrong as well, mostly because everyone else I was playing with did. Then I started running 5e, and my first adventure was Sunless Citadel, a tier 1 adventure with tons of DC 15 and 20 Perception checks. The players all had darkvision, and were planning to not use any light in the adventure.
On a whim, I looked up darkvision, realized how it worked, noted the disadvantage on Perception, and it didn't take long before someone started using dancing lights, much to the Rogue's annoyance.