I've found it fantastic for eg UML-like class diagrams. It has a beautifully simplistic approach to UML (which is an overdesigned mess, but that doesn't mean that all class diagrams are useless): for each class, the method list and attribute list are just two multiline text fields. Compare that to other UML tools that have a "Edit Method" dialog and whatnot.
The UX is amazing, especially once you get the hang of it and know how to circumvent its few quirks. I find that for many kinds of diagrams, drawing them in yEd is faster than on paper (the actual drawing is roughly as fast, changing my mind is an order of magnitude faster)
I've found it fantastic for eg UML-like class diagrams. It has a beautifully simplistic approach to UML (which is an overdesigned mess, but that doesn't mean that all class diagrams are useless): for each class, the method list and attribute list are just two multiline text fields. Compare that to other UML tools that have a "Edit Method" dialog and whatnot.
The UX is amazing, especially once you get the hang of it and know how to circumvent its few quirks. I find that for many kinds of diagrams, drawing them in yEd is faster than on paper (the actual drawing is roughly as fast, changing my mind is an order of magnitude faster)