I do think a lot of whether or not you hide from your kids depends on the circumstances.
For me personally, a break now and then is refreshing. I am a work at home mom, and I can literally count on one hand the number of times my kiddo and I have been apart for more than half an hour. We spend most of our time together, at home, at the grocery store, etc., so having a nice break (usually after he goes to bed, since he sleeps a few hours before I do) is really helpful.
I think it just depends on your personality, your kids' personality, and how much alone time you get otherwise, and how much alone time you need! Lol.