[cLeEOGPw]

Text probably serves better because code is often too complex to visualize in some cases, and in others to comprehend generated visualized code.

Think about algorithm that switches values by using temporary variable for example. By looking at text, it's pretty simple to construct the flow follow the values traveling from one variable to other. But if you put it in 2D graphical interface, it becomes very problematic and hard to follow. I would imagine it would be easier if there was like a movie where value would move from one box symbolizing variable to other. But that would make it difficult to edit.

Another way would be to visually represent only change, but then it would be same as textual representation, only more redundant.

[r00nk]

Actually I can think of a simple way to visualize that.

The debugger actually displays what I call a folded lattice, meaning that execution starts at the top and goes down, so representing what your talking about would simply look like ">" with lines. It would need some representation of data flow, however, which it currently doesn't have.