I have been using Acad since V1.0 on CPM-86. Intergraph, Bentley Microstation, Draftsight, Catia, Solidworks, NX and others. The use of shortcut keys are a great time saver. C for Circle, L for Line OF for offset etc. If there could be a standard set of shortcut keys and a dialog box to create your own similar to Draftsight and Acad which are the easiest.
Just a suggestion to improve the product.