From the comments - Rob Pike (about 2 hours ago) : What Russ doesn't stress enough is the major thing Acme brought, beyond what it borrowed from Oberon etc.: t

From the comments - Rob Pike (about 2 hours ago) : What Russ doesn't stress enough is the major thing Acme brought, beyond what it borrowed from Oberon etc.: the contextual right click. One button click gets what I want, be it the next appearance of a word, the line the compiler's complaining about, a man page, a PDF file, a UPS delivery notice, whatever. If the data's here, jump the mouse to the location (another thing Russ didn't point out) and highlight it. If it's not there, load it and jump to it. One click, context-driven. It's hard to appreciate how powerful and effective that is without trying it.