I use MJ for boring tasks, and to obtain useful information. I tend to build rockets with just enough fuel, and seeing TWR or approx. delta-V etc... are all nice. I also use node adjustment tool often too, to plan precise maneuvers (not the auto-node-planner). Etc... etc... you get the picture. I rarely use the automation tools, sometimes I'm not in a mood to get into an orbit, so I use ascent guidance (sometimes, these are very boring to me as I've already said). I used MJ as a fast-how-to-space source before, now I barely touch any automation, but get all the information. In my opinion, it was your fault to use every automation tool that MJ offers, and it was your fault to not learn anything