It's not just the stoppers. The express service is now collapsing because as the stoppers get cancelled they're turning the expresses into stoppers to give intermediate stations some service.
I have to agree - for example, look at the Kings Lynn services last night. The 1941 is 17 minutes leaving Cambridge. Then it is almost 2 hours before another train to Kings Lynn! The 2038 is 58 late arriving at Cambridge and is then cancelled. The 2108 is 34 late arriving at Cambridge and is then also cancelled. The 2137 runs, but is 21 minutes late leaving Cambridge.
(I was there to watch this debacle at Cambridge last night as I was trying to get to Ely and unfortunately just missed the 2115 GA to Norwich. The whole time a 700 which was supposedly the 2127 to Kings Cross was blocking platform 4. No announcement as to why it wasn't leaving (according to RTT it never left!).
The 2038 arrives 58 late on platform 1, sits there for 5 minutes or so, and then they decide to cancel it and tell everyone on it to get the 2108 by making the very long walk over to platform 8. The 2108 arrives on platform 8 34 late, decouples the front 4 carriages as expected, and then itself just sits there! Then the (also extremely late, but at least they had infrastructure excuses) 2016 GA train arrives on platform 7. All the people now on the 2108, including those who were on the 2038, are now told to get this instead (!). Except for those for Cambridge North, who are told to go all the way back over to platform 1 (!) and get the 2137, as the GA doesn't stop there. The GA leaves for Kings Lynn. The 2108 is then also cancelled. The 2137 finally leaves for Kings Lynn (with me on it).)
It was bad 2 weeks ago. It's *much* worse now.
I agree. The Cambridge fasts were originally the least affected, so they're now being used to attempt to ease all the other issues.
I have to take a train to London soon. Seriously thinking of using Greater Anglia instead. It may even be faster.
Cheaper too, if you commit to a GA-only ticket

But yes, I've been doing this for a while and generally I'd recommend it.