PCB routing around capacitors "snake style" possible electric disadvantages?
Well, the obvious thing to do is make a ground plane and stop worrying about this sort of thing ;)

Since you probably don't want to do that, that ground stub is unlikely to hurt anything. However, I'd suggest getting rid of the stub, bringing +12 in a bit to the left of its current routing, then make the connections to C7 and C11 on the opposite sides. In other words, flip C11 and C7. From the regulator, run +12 diagonally to C7, then vertically to C11, then diagonally to the existing 12V line. 

And beef up your ground trace as much as you can. If you're worrying about the relative attenuation of the bypass caps (the usual reason for using several different-value caps in parallel), you're worrying about high-frequency response, and you need to think about minimizing the impedance of the ground trace. Like I say, a ground plane is the way to go, but if you can't do that, make the ground traces just as wide as you can, and avoid serpentine ground traces. Try to add some traces to turn your ground trace into a grid.