This is what I do as well.. pretty much ensures I never accidentally leave them on because it's just my habit.

Only real down side to running them when you don't need them is they will burn out faster... which is less of an issue as more and more cars move to LED lights. Of course some of the Halogen lights will last for years even if you run them anytime you drive but my lights are awful so I have to buy the brighter ones that only last a year or so and for that reason tend to use my daytime running lights more frequently or use my high beams during the daylight hours to conserve my lowbeams.