^
Yes that's a good description of what happens to me at times. Sometimes I think it would be useful if I just had a text document always open on my computer so I could click its icon on the taskbar and quickly jot down a key word or two whenever something occurred to me that I "really ought to be doing soon." The essence of what I think I need is a very quick, easy-access thing so that I can continue to pursue the task I was pursuing just before the second (, third, fourth, etc.) task(s) occurred to me, without being distracted from the first task for long enough to make me lose my thread. Which is just the kind of device a person with a lousy short-term (or more properly, "working") memory might find very useful.
What is an uber mind map? I suspect that when I've tried to create Buzan mind maps, although I think in pictures (at least I think I do), my habitual style of working is in words, and long strings of them at that. I even have difficulty using key words and writing notes that omit words such as "the." Somehow my brain insists on trying to write a long essay with perfect grammar and syntax, carefully checked for anything that might not be quite correct, all the t's crossed and the i's dotted. So it's often hard for me to keep the detours short and glib enough to allow me to easily return to the original matter. I guess this is because of my ASD brain wiring that tends to leap headlong into the details of whatever its attention is turned to, and perfectionism makes me stay there trying to get all those details right.
But that's what happens in the worst case. In the average case, I sense what's going on and I make some effort to counter what my brain would otherwise do, and I have a few little coping strategies to mitigate things. When I'm on the Web, for example, my use of browser tabs helps - every new idea I've opened is likely to be a tab or two, so when I come to closing the browser, naturally I look at each tab, and am reminded what I was doing before something else came up.