I use absolutely no autocrew in missions where there are only a a handful of contacts. In this situation i really find it very enjoyable.
But
Missions with many contacts it just gives me a headache and i feel like im "at the salt mine".
a good way to learn how to play with no autocrew is to create a small mission for yourself with just one enemy set on a "random box". Start close enough so youre not overconcerned about locating it. Since you will know what type of enemy and what speed its set to , this help you get comfortable at NB id , demon station, and TMA station. (by reversing learning process)
once youve reached that comfort level set up a dymanic group to generate 1 of 20 different subs at various speeds so you have to ID and demon them correctly.
as you improve, edit the dymanic group to randomly generate between 2 and 5 enemies to increase the complexity level.
One of the things i used to do in the single enemy scenario, was as soon as i fired my 1 torp i would quick turn truth on so that i could see just how accurate / inaccurate my tma was. just for the purpose of judging myself. i would then turn it back off (regardless of perceived accuracy) and see if it hit. if i missed i likely have to look for an incoming shot and track/tma it then assuming i survive, set up another shot and again fire only once.
Theres a feeling of satisfaction that comes with using no autocrew.
personally i find it extends to the tracking of incoming torps.
I find that leaving active intercept OFF makes me more cautious , more likely to stalk the enemy and try to set up the perfect shot because i have a lot more to do if it returns fire.
i find it just as satisfying to have tracked / TMA'd a torp and suddenly realized "OMG its actually gonna hit me" and just barely get it with a cm, as i do getting the tma right on an enemy and sinking it.
theres a lot of different ways to enjoy the game.
no single one of them is "the right way"
enjoy as you see fit