I have made a modest number of contributions to Wikipedia and Wikimedia Commons. I would say the worst experience was going through a somewhat bureaucratic process to have a page updated to then be ghosted by the person who suggested the process. Eventually I just did a WP:BOLD and made the edits myself, which remain there to this day. The best experience is being 'thanked' (there is a button for it on a page's edit history) by a page's self-appointed 'owner'.

From my perspective, if the edits are uncontroversial, it appears as though the response will be too. Editing Wikipedia is, socially, neither an overwhelmingly positive nor an overwhelmingly negative experience for me. I do it now and then as a purely altruistic endeavour.