This^^^^. It has helped my sailing a lot. (Except when I'm solo, then otto knows the 90, but otto overcorrects too dang much) But if I've got somebody to run the jibsheets, I can helm and run the traveler and my old pig of a c-30 looks great going through a tack. Not as good as Jackdaw's looked, but good. Well, at least not embarrassing. Sometimes here there's no visual cue for the 90 (like looking out over the pacific, or when it's hazy) - but practicing hitting the right heading visually sure helps to get the feel of it.
I feel for you guys up north. Reading all these stories about the first sail of the season was great.
I caught a cold recently and went THREE weeks without sailing. It was terrible. Longest since I've owned the boat. Had a great sail last Sunday to make up for it. Winds were really flukey, on and off and from random directions all day. We'd be going hull speed for 20-30 min, then drop off to like 1-2kts. Repeat a while later on a different heading. Coming back we were about 2-3 miles from the harbor absolutely becalmed. After the boat sat and spun a coupla 360's I decided to turn the motor on.
(y'all did ask to tell sailing stories)