Compared to Pre 2005, this is no great drought, it's just a short lived pause!
I think for me, during the 90's when the show wasn't on at all, it coincided with all the stories coming out on video for the first time. It's what kept the interest going and there were also the spin off stories too like Downtime, etc and those non Who but related stuff like The Airzone solution etc
You also had the special releases like The Hartnell/Troughton Years Etc. (Oh, what a shame they never did a 'The Davison Years'

)
The 30th and 40th annversaries helped keep the show in the public eye and then there were the repeats of stories not yet released on BBC 2 and some of those had fab mini-documentaries like those that preceded Planet Of The Daleks. The Resistance is Useless Documentary was a bit weird though, hosted by some chap in an anorak.
There was also a season of stories featuring each Doctor up until that point. Again, some stories that hadn't been released at that time were featured as well.
So all in all there was plenty of who stuff to keep us going. Off course, it didn't make up for the lack of new episodes, was always pining for that but really, the so-called drought we have now is a picnic compared to the 16 years we had before. (TV Movie aside)
Just trying to think back to the 18 month hiatus back in 86 as well. Don't remember much about that at the time but at least after a while we knew the show was coming back even if it was over a year away(A bit like now) In the 90's we didn't have that luxury, we thought the show was probably gone for good.