I only do it if I wanna get a villager out to someone quickly (which only happened like 1 time).
I play the game with heavy time traveling. A lot of my enjoyment comes from landscaping and obtaining my dreamies. These are done most efficiently through time traveling (either to cycle out unwanted villagers, get materials for landscaping, unlock parts of the game I still havent unlocked on my 2nd town). I dont really like slow games but with time traveling ACNL feels more fast paced and still allows me to feel creative with landscaping the town