I have been producing documents (both mathematical and non-mathematical) with Latex for about two years, and I feel rather confortable with it. Now I would like to learn Tex, but I wonder if there are any real reasons to do it rather than just for the fun of it... Is there really anyone using Tex when that person could well be using Latex?
"Learn TeX only if you would like to become a typesetter",
this is a memorable sentence our school project leader answered this question to my colleague years ago... :-)
LaTeX will do the job 99% people need. There is a perfect book about TeX - TexBook naruby, unfortunatelly in Czech only (I doubt it was translated). But just look at it just to get shocked and assure that you really don't want to learn TeX :-)