Epona222: I'd rather have this barely noticeable delay than loading screens - and really it's one or the other so take your pick, IMO this is the lesser of two evils.
Corylea: Agreed. Everyone complained about loading screens, and they're mostly gone. The price is that we have to actually open the doors. :-) I'll take it!
And if there had been loading screens instead I reckon there would be far more complaints. I hang around a few forums for upcoming games I am interested in and there are always topics about how annoying loading screens are, begging the developers to get rid of them and please make sure there are no loading screens in their next release - even if it's completely unrealistic to expect that.
In some types of games I think that the current PC/console hardware will not allow as much freedom or seamless transition as some people imagine is possible (where there are really massive areas with lots of AI routines and objects and physics etc. - massive open world games and huge space sims come to mind), but in TW2 it was possible and I think they managed to get it just right. Geralt slows from a run, leans forward to operate the door, opens the door, and walks through before taking off at a run again (or when entering an interior the screen fades to black briefly during the transition) - I think that's pretty damn good, and CDPR did a really good job with it IMO.
As I mentioned before it is an almost seamless transition for me when I am playing, I don't know what people with hardware not as good as mine are experiencing.