you should also consider the time it takes to charge the case and the times when you want to listen to music but alas, you forgot to charge your earphones! The jumbled mess of earphones don't need to be charged.
Except the original post said to "count the time you spend untangling the cord" (which, for most good, flat-wire headphones is almost zero). Habit or not, charging takes more time than properly rolling the cord on wired buds.