I agree to some extent. Though, I don't think it has to be a trade-off though. After a sub-5 second compile time, I go over to get a coffee to ponder the result

I agree to some extent. Though, I don't think it has to be a trade-off though. After a sub-5 second compile time, I go over to get a coffee to ponder the results of the compile rather than imagine what those results might be. Taking time to think is not mutually exclusive to a highly responsive dev process.