I don't know how much interest there will be in this, but another Discussion got me to thinking about some of my favorite enhancements, so I thought I'd start a Discussion where we could list our favorites. I'll start with several of mine, and add to the list as I think of more. Someone (maybe me) may see one here that they didn't know about.
1. The "Select bodies..." button for detailing multibody Parts.
2. SW2010, if I'm not mistaken, greatly improved mirroring components in Assemblies. The feature was just about useless before that.
3. Creating a Plane midway between two surfaces.
4. Changing the sheet format for multiple sheets with one operation in SW2017.