I would love a tool that persisted and indexed shell sessions, for later examination or searching. (Go back to paper teletypes?)
miniblog.
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I don't preserve browser tabs between sessions. It's a surprisingly helpful way of staying on whatever side project you planned to play with.
Persisting editor and mental state across debugging sessions is really hard. It's often easier to have a single, longer debugging session.
Emacs tip: use savehist-mode to save minibuffer history between Emacs sessions! (via https://www.reddit.com/r/emacs/comments/1umzxo/full_persistent_minibuffer_history_it_was_built/ )