Will, you can't compare two wildly different shows/projects at 24p versus 25p and claim the frame rate is a major contributor to that look. I guarantee you there are myriad of other things beyond frame rate separating Braveheart and Doctor Who, money and time being the biggest two.
In PAL countries 24fps films are generally just literally played 4% faster. No frame interpolation, they just play them 4% faster and pitch shift the audio back down to the correct pitch in correlation to the speed. No one in PAL countries minds, and if you are even in a PAL country watching a film on television I'd doubt you'd even notice.
If you watched the same scene, shot on the same stock at 24fps and 25fps, and played back at 24fps or 25 fps you almost certainly wouldn't notice any difference, it certainly wouldn't make you react differently to the scene.
You MIGHT notice a difference between 24fps played back at 25fps if you are familiar with the footage and can spot the slight speed up, or 25fps played back at 24fps and notice the slight slow down, but most people (as attributed by the fact that we happily watch 24fps films played back at 25fps in broadcast and PAL DVD in PAL regions) don't notice and it doesn't have an effect (other than maybe in PAL countries we might talk a little bit faster. ;) )
While frame rate makes a difference, 24 vs 25 is not an artistic choice that has any impact on the viewer, it's pretty much purely a technical one.
The frame interpolation you saw was probably motionflow or some other optical flow tecnology if the different was glaringly obvious, a new technology designed by alot of the tv manufacturers to make sports etc look ultra smooth and in the process makes all movies look like shit. This does indeed use frame interpolation to increase the refresh rate to up to about 120hz, creating fake frames between the real frames so everything looks like video.
This isn't pull down, it's something else. Pull down repeats a field every two frames, noticeable but nowhere near as disturbing as motion flow.
If you have watched 24fps orginated DVD on many NTSC televisions (especially any CRT) you have been watching 3:2 pull down. You have likely seen so much of it you don't actually notice it, unless you were brought up in a PAL country where instead we have historically watched media at 25fps, so just 4% faster that it played back in cinemas.
24P playback is available on NTSC DVD's - but the TV would have to been turned onto Progressive mode, which wasn't common until I guess 4 years ago, and I'd wager still a lot of 24p media on dvds is watchend with 3:2 pull down even if the tv is capable of showing it at true 24p.