I wouldn't call it extensive. I had many trips between my country of residence at the time and my home country. I remember reading that we didn't need to input those, but i did anyway. 15-20 entries if I remember correctly.
Funny thing though is that I considered mine a "complex" application. But I basically sat and thought about any possible questions an agent would have, and added an organized explanation in an LOE. If there was a question, my LOE would already have an explanation and every opssible supplemental document already attached. My goal was to make sure there would be no interruptions for ADR etc. If I had to guess, that could have resulted in a quick RFV.
But to be completely honest, I got lucky. We are all but certain that they're trying to push out recent apps a bit to artificially bring down processing times. I just happened to be one of the lucky ones in this iteration.