Two important WCML junction stations - Nuneaton & Rugby have done well in terms of platforms. Dunno if the Up Fast platform at Rugby (No.4 I think) sees much use? - the rest are well used though. Historically Rugby had up to six bay platforms. At Nuneaton, since the removal of fast stopping trains during the daytimes, platforms 3 & 4 are only lightly used and platform 1 was never heavily used.
When Nuneaton only had five platforms, every departure to Birmingham and most of the trains to Coventry left from platform #1. It was almost certainly the busiest platform in terms of number of passengers who used it, and probably the busiest in terms of number of trains which stopped there.
Now Nuneaton has 7 platforms, platform #1 is very lightly used, but it's probably important to point out that Platforms #6 & #7 are essentially the old Nuneaton Abbey Street station. Im guessing now, but when Abbey Street closed to passengers in the 60s to save money then the number of conflicting movements with the WCML at Nuneaton Trent Valley would have increased dramatically.
For those who are unaware, trains from Abbey Street on the Birmingham - Leicester line essentially passed through the sidings at Trent Valley anyway and as Trent Valley Station is slap bang in the middle of Nuneaton town centre and Abbey Street was a good 20 minute walk away then you can kind of see the arguments that would have been made to merge the two stations even if it did mean increasing the number of conflicting movements, especially if the people in charge at the time were trying to make Nuneaton into an important point of interchange.
What Nuneaton has now is probably what should have happened in the first place. One station which is right in the heart of the town centre which makes changing from local lines in the west and east midlands onto the WCML (and vice versa) an easy thing to do, even if it does mean having quite a lot of platforms.