I know its actually a bit more work with all the different types of entrances/ladders, but I think it would be worth a bit more animating for that extra realism boost. Animations would need to be dependent upon the situation in which you open the door; so you would have a quick animation for when the PC is in combat and uses a door, a regular animation for non-combat situations, and a sneaking animation for when they activate the door in sneak mode/enemies are nearby.
What do you guys think? I'm sure some people couldn't care less about something so mundane, some of you think the development time would be better spent working on whatever game-play element you personally think is more important, and some of you think that I'm a moron for not checking if this has been discussed previously on your precious forums; but I'm a bit more interested in the opinions of you few people that don't fall under those categories... Thanks!
Edit: Food for thought: Couldn't the NPCs at least be seen using real doors? It was always really weird to see NPCs fade away before a closed door in Oblivion...
Edit 2: I have been requested to provide evidence... I don't link cause I don't want to be banned, but:
Check out the short or the extended demos (easily available elsewhere, and we've all seen them already) that Todd Howard did during E3, when the PC enters "Bleak Falls Barrow" there is no animation, just the standard transition between the exterior cell and the interior cell.
Later in the extended Demo we see another wooden door behind a Dragur being slain, which the video cuts away from before entering the next section, confirming that at the time of E3 they didn't have an animation for exterior to interior cell travel, or an animation for interior to interior cell travel.