I really like vscode-powertools - allows you to add buttons for configureable actions to the status-bar.
With todo-tree I keep track of TODO-comments in my code. VERY useful!
And I use the "Bad Code Highlighter" to highlight my typical problem: unpaired quotes. (You can configure a rx and if it find it, it would highlight the line)
Finally I found Favorites Manager to be useful to keeo a list of my favourtite file easily at hand.
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