As a kid I watched my mom produce plots in Microsoft Excel and even then as a first grader Microsoft Excel had a pretty steep learning curve. Some school computers had the whole creative suite, from Adobe stuff like Photoshop to Macromedia stuff like Freehand and Fireworks. All of these seemed overwhelming to me when I was in the first few years of elementary school. It only began to make sense in the later years of elementary school and in middle school.
Our school computers didn't have those but my friends and I figured out you could make animations in PowerPoint, using the extensive clip art libraries which were installed for some reason (don't remember my home computer's powerpoint having nearly that many images). Also for some reason the teachers would let us goof around for the whole hour during computer lab time every Thursday. To this day I still don't think I have laughed harder than at a particularly stupid one my friend made.