I think this is a good distinction to make. Something I've been realizing from the way I see other people talk about and deal with being alone in situations, is that I have a much higher-than-usual tolerance for solitude. (Maybe a trait shared by others here on HN because of our interests and pastimes?) I'm pretty sure I can be in an isolated place for months at a time. (Of course I'd want the internet, books, music etc... being alone like in The Shining or in solitary confinement is a whole different situation.)