I use culling mode with a single picture.
I work through hundreds of images with it after I come home from a reportage, event, wedding, etc.
It’s the only mode where a true instant switch between images is possible in any zoom.
It does not have the fit-100%-200% steps with the middle mouse button but only Fit and 100%.
The thumbnail bar isn’t broken like in darkroom.
And since I only ever have a single project imported I can easily prerender even full size views to disk with the commandline tool and therefore use practically no CPU/GPU power at all when flipping through the images.
It’s fast, it’s effective and the full lighttable is only an “x” away.