In the earlier days when they were slower and their code was worse so you had to review it, I’d watch the model code and just noodle away on guitar while it did its thing, interrupting it from time to time. Now they’re too fast for that to work, but still too slow for it not to be worth it to start a new task. It’s an awkward in-between stage.
If Anthropic made fast mode four or five times faster rather than just twice as fast, I’d probably shell out for it sometimes just to be able to single-task productively.