I will copy my suggestions I've made in the modeling thread regarding the keys on the timeline.
it would be cool instead of this
to have this
By “cool” I mean more intuitive.
Even better than pic. #2 would be to have the green stripe narrower because when multiple keys are next to each other it becomes a green mass.
The same for the Dopesheet.
How many keys are in there:
Surprisingly the number of keys is one that humans can count at one glance - it's five.
You obviously need to zoom in or go into an editor to see how many keys you have there and I don't have a big time scale (only 250 frames) to say that they're too close to each other. I can't see myself being very happy animating a character with this visual feedback in the timeline.
An advantage of having it the way I suggested:
if you have a (narrower) key at frame N and one at frame N+1/2 you could represent the latter like it is now - in between frames and the integer one (N) at Nth frame.
Here's an example:
Their width should adjust dynamically in relation to the timeline size, so for frames next to each other on a big timeline their width would be minimal (no smaller than 1 pixel in width obviously).