Yes! 
That solved my problem.
(But not immediately…)
Huge thanks @josef
Long story to help others:
The left pane of the Dope Sheet is populated with all properies that have keyframes…
BUT ONLY if their property panel is OPEN in the properties window.
This is normally the case, unless you hit the upper limit, in which case the first opened will be closed.
So, increasing the limit to 99 (or 100 seems to be max) will help a lot.
Tool tips and the text in the settings dialog suggests that setting it to “0” means “unlimited”.
This does NOT work.
SOLUTION:
Increase the property panel limit to 99, and double-click ALL nodes with keyframes in the Node Graph in order to open their properties.