I have used AutoCAD for many years, 3DMax, Corel since v3.0 , and a number of other 3D programs no longer extant. Corel had a great 3d ability at one time, but they killed it.
Today I am using mainly three programs. Inkscape for vector graphics, Gimp for pixel graphics, and Blender for 3D. Irfanview for image management and really quick graphic stuff like cropping and stuff you can do to the whole image, which in the number of times I use it it is more often than Gimp, but most stuff is just a bit of cropping or color balances and Iranview can do the job and be gone before other programs can start up.