I am used to Kino (also codeveloped by Dan Dennedy!) and I find the kdenlive interface (and the Openshot one) inefficient.
In kino you can import a directory of fragments of video, and Kino will quickly and automatically assemble them to a very compact SMIL file that you can play with Kino immediately. At this point you can edit the movie and most operation are instantaneous since it is just updating the timeline.
In Kdenlive/Openshot, importing the fragments is very slow and then you have to assemble them manually by dragging them to the tracks which is very slow and error prone if you have 50 fragments of 10s. Then doing a cut is very slow for no reason.
Also while kdenlive support AVCHD, there are no support for the metadata generated by the camera.
I cannot help but feel Kdenlive/Openshot fall for the powerpoint effect: attract users with fancy effects to give a "professional" look while they are actually the hallmark of amateurish movie.
Kino by contrast lets the users focus on the footage.