With modern games you have to wait for like six hours for the stupid thing to download, if you even have the hard drive space to redownload it in the first place
Is that hassle worth it just to revisit some game from your back catalogue for half an hour? Eeeeeeeeeeeenh
On Steam my startup times are pretty decent even when the games are installed on an old-fashioned HDD. You can also disable intro movies, which has been a godsend with Gears of War Reloaded. The studio intro has obnoxiously LOUD grinding chainsaw sound effects that legitimately hurt my ears
Also I often find myself launching a game, then doing something on the other monitor while it starts and forgetting the game there for 10 minutes