It probably depends on how you define 'heated'. I've only been a member here since the beginning of January, but my impression, based on experiences on other forums, is that WP is a generally positive and civilised place where the level of intelligence is noticeably much higher than on most internet sites - but then, superior intelligence tends to be an attribute of people on the autistic spectrum. Members seem to be able to have reasoned and well-informed discussions on a wide range of subjects, to quote accurate and reliable sources and to respect others' points of view. When I first joined I was warned that the PPR form could get fairly agitated, which is true, but that's just the contentious nature of those particular subjects.
Of course, some of the debate here is about highly personal and sensitive issues that are raised by people who are very isolated and at times distraught. From what I've seen so far, most members behave in a very sensitive way, sometimes introducing a note of wry humour.
Neurotypicals have much to learn from WP.