Not speaking of Lent specifically, but abstinence can restore enjoyment as much as teach impulse control. Take chocolate for example; overindulge and it'll lose it's appeal, so then take a month/40 days/etc break from it and you'll be able to eat it again. Or -more anecdotal- in Ramadan Muslims are supposed to abstain from food & sex during the day, this leads to a lot of 'feasting' once night falls as well as a marked increase in sex.

You don't have to do Lent or whatever, but such rituals are/can be quite useful.