I don't know. I was in 4th and 5th grade when I did the Dacta class and was probably in 6th grade when I got Mindstorms. I got it right after it came out, I don't think any of the new IDEs that are available now were available right at the release.
If I was still interested today, I'm sure I wouldn't be disappointed. In my Intro to ECECS (Electrical and Computer Engineering and Computer Science) Lab, we made a Mindstorms robot that had to traverse an obstacle course. The IDE we used still used "blocks" to represent functions, but it wasn't as simplistic as the LEGO IDE. I think you could even look at the code behind the blocks if you wanted to.