Definitely! I only shave in the shower, except I use the Fusion.. Used Mach 3 for years, till I got the Fusion. Love it.
I've had the same shower mirror for 4 or 5 years now. It stopped be "fogless" years ago but I just use a tiny bit of soap, spread it around and splash off. This is usually good for 4 or 5 showers and takes a few seconds.