This great little add-on from Jason Van Gumster has been a lifesaver ever since I started animating in Blender, what it does is pretty simple, there is room for improvement still but as I talked to him about it a few years ago seems that the blender API at the time wouldn’t allow what we wanted, maybe it’s time to check if anything has changed there.
So as you install it, then you can go to your graph editor
Select the channel that you’d like to “Isolate and Frame”
Hit Shift+V, and voilá!, your channel is isolated and framed =)
Improvement?, yes, we think that the isolate and frame operation should be automatically done when you select one or multiple channels, without having to go and hit shift v, but this works well enough for now.