I watched the classic series over 30 years ago. If I see one of those classic eps now, I think it's so slow & plodding I can't believe I used to be able to make it through the whole thing.
I still enjoy them, but it's hard to sit through most of them now. Sure, some of the nu-series eps could use a little more padding out.
I introduced my Fiance to Dr. Who with 'Rose'- she loves the show and since we have no cable we buy each new episode on Amazon Prime. I tried to show her a couple of the classic shows (Tom Baker era) and she hated them- "Looked like a high school play" was how she described it. Since I started watching in that era it never bothered me- like ignoring the puppet strings in Thunderbirds.
The Tom Baker era I have a special fondness for- I got a chance to visit his TARDIS set when it was at an exhibition at the Museum of Science and Technology in London. I twas part of an exhibit on how they did SFX in films and TV. Saw fog machines, cobweb sprayers, then I found myself walking past a wall of glowing hemispheres and onto what appeared to be the bridge of a starship (I had never seen the show before and thought this was just a demo mock-up like the haunted mill I just left). There were some walls where the camera was normally- one was a window into space showing several spacecraft miniatures flying in formation, one had a view of a planet with Cyberman, Dalek and a couple of other aliens and this interesting hexagonal console in the center, They had protective covers over some of it, but some of the controls you could activate. It was a couple of months later I saw my first Dr. Who on the local PBS channel and there was the same set with Tom Baker at the controls. Despite the advances in production his era is still one of my favorites...