I regularly access the links in the personal-toolbar, especially the Watchlist, Userpage, and Contributions links.
It's also good to encourage new contributors to use these 3 links (watchlist for participation, userpage for notes-to-self and self-expression, contributions for easy access to past work).
I would love to see those added in Timeless, as directly accessible (always visible, always instantly 1-clickable with no flyout-navigation required).
I liked some aspects of the old https://www.mediawiki.org/wiki/Compact_Personal_Bar experiment (which IIRC was also part of Winter?). Perhaps that could be mined for ideas (things to use, things to avoid).
Semi-related (possibly a different task), I like having my username displayed directly at the top of the page. It gives a certain sense of personal connection, versus the impersonal "Your account".