Oh they're totally painful, I agree. And as you know, have to be kept up with. Here's an example: While in one of the aforementioned form recoveries, I was #2. I'm SA-maxed out just maintaining close (about 2-3 feet separation) on lead's jet as we're being vectored around from one approach to another on a runway change....I can only see his wingtip and his position light, not even his fuselage or canopy with the WX going by. So I'm buttholes and elbows just trying to swap instrument approach plates on my kneeboard while maintaining form, which itself took three attempts to complete. While doing that, I'm following the vectors on the HSI with the captain's bars, keeping note of where we are in relation to the field during the vectors, and trying to get the NAVAID freqs and other approach information into the HSI and quick plate study of the pertinent info. As we're turning onto radar base, lead advises that he has Nav flags on both parts of his ADI and HSI, and "2, assume lead on the right". I had to now be a stable platform, pick up the squawk, inform ATC that we had a nav problem with the lead jet and were swapping lead in the soup while continuing vectors, and keep my SA up while the localizer is coming in. Meanwhile, lead is performing a backing maneuver to fall into position on my left wing. I have to mentally think of centering the LOC, capturing the GS, when to configure and when to signal that to my now-wing jet, I have to think about breaking out and if we can't land (if the runway is now wet)...how I'm going to drop him off to complete his landing and I'll perform a missed approach for vectors back around, and I had to communicate all of this clearly/concisely/correcly to the ATC controller, so they're in the know. I'd had the foresight to request the PAR, but it was down as it hadn't been recal'd yet from the runway change. So the workload was extremely high, but we made it happen, and due to rain on the runway occurring, I had to do just what I'd planned: break out of the WX, drop off the wingman to land, and execute missed for a single-ship vector back to land. With no NAVAIDs, I couldn't separate or drag him on final.
These are just but a few considerations that need to be made with formation flying, all made worse when IMC and with a sick aircraft in the mix. TONS of stuff that has to be trained for, planned ahead for, understood, standardized, and executed in a timely and efficient manner.