I need to write a longer post about this, but systematic design (the idea behind ISD, ADDIE, HPT, etc.) is not a bad thing. The bad thing is getting caught up in the "grain of sand" syndrome, whereby the designer gets locked into endless analysis and research (even for instructional problems where excellent solutions are well-known).
This is an issue that has been bugging me for several years now. Maybe it's time I got it out of my system. Or maybe I just need to get over it.