Yes I agree I only use the ExtendScript Toolkit Object explorer to learn what fields are in objects. I have trouble using it for debugging because of the way window contents jump about and some of my script that work don't work within it. I'll sometime use its editor to see its syntax highlighting help me find typos, find missing brackets and tidy up my code. Most of my debugging is done by adding alerts statement to check on things. These alerts are later removed or commented out.
Also Adobe's scripting guides is the only books the document their Photoshop DOM however it lack some information which can be found in the toolkit's viewer. The viewer also has basic system object used for using your OS file system which you may want to use these objects are not in Adobe guide the are part a javescript. Also because your using javascrip dont forget about web searches often you need information about javascript. Search the web. Some day I may buy the javascrpt rino book.