There's a learning curve for sure, but it's not too bad once you learn the basics of how audio and MIDI are handled + general JUCE application structure.
Two tips:
Don't bother with the Projucer, use the CMAke example to get going. Especially if you don't use XCode or Visual Studio.
If your on a Mac, you might need to self-sign the VST. I don't remember the exact process, but it's something I had to do once I got an M4 Mac.