I'd prefer not to close my lid every time I want it to sleep, the fn + f4 key is perfectly fine.You can also close the lid and it will put the laptop to sleep as well, if you haven't changed the power settings.
I mean I no longer mind having that much dust accumulate anymore, I just wipe it down every morning and that's it. I wanted to turn off display when taking a short nap for a short period of time, so having the display turn off with a few buttons is very convenient.Closing the lid helps keep the dust out of the keyboard and off of the screen.
Yeah, it's only for a few seconds unfortunately dust will collect in the crevices no matter what so at least I wipe off what I see at the surface.Wiping the keys down does not get to the dust/dirt that has fallen through cracks and crevices around the keys.
But hey if you enjoy that daily chore, and since it is your computer, knock yourself out.