It's interesting to hear you've had similar experience.
I used Isaac Sim for research work a few years ago (https://github.com/qcr/benchbot) and, although its capabilities were head and shoulders above the rest, its usability was amazingly convoluted. Even simple things became week-long dives into undocumented blind digging.
Part of why I'm so interested in the experiences of people actually using these tools for something productive.