Sometimes I binge sometimes I don't. It's good to have a buffer and the option to watch all at once or in bits. I find you can overdo bingeing which spoils the experience and once you're fatigued it's hard to get back in the groove.
Depends on the series. Mostly watch Netflix so it's all there to begin with.
I binge watched the first season of Witcher for example, but that's because it's quite good, wouldn't binge watch most things as don't have the time and usually series can only hold your attention for so long.