Thank you Rohit. I now realise what the problem is: The current Wolfram Workbench site https://www.wolfram.com/workbench/ and its big red "Get started" link http://support.wolfram.com/kb/27221 make a big song and dance about Eclipse IDE, yet NONE of the Wolfram help videos mention "Eclipse" at all. Only after carefully "pattern matching" the help video screen shots with the actual Eclipse IDE window (the two are NOT identical) have I convinced myself that I may be able to apply the help videos after all.
