I observed all of ds's VT sessions and did the practice every night. In my untrained mind, it seemed very much like OT that focuses primarily on the visual system. I am still not sure if I endorse VT - my son hated it, practice was a nightmare, and the benefits seemed to wear off over time.
My son's LD school recommends forms of cognitive therapy that address these systems in a similar, but different way. We have not participated, and again I am a bit skeptical. But, there are number of believers out there that are much smarter than me! I tend to be a bit conventional when it comes to treatment and try to focus on where will get the biggest bang for our buck. For my guy, reading is the main issue, so I tend to focus more in this area.
We've done OT and VT - but stopped at age 8. I do think this is all related and various disciplines can help - it's hard to decide where to focus efforts and how to measure results and improvement!
Yes - we did some of the worksheets at home. Tangrams are good too. Puzzles, dot to dot etc.