The biggest issue I have with these is never really knowing exactly what triggered them in the first place.
This is especially difficult with the Model 3 because I'm not going to look at the screen when my attention needs to be on the road. I really wish the Model 3 kept an Event log along with snapshot pictures/video.
Sometimes these events are obviously like a good example is someone turning a right in front of me, but where they'll be mostly out of my lane. I know I'm good, but the FCW will beep as it's not smart enough to realize there is already enough clearance.
Other times they're not obvious at all. Like a few days ago I was in my Jeep Wrangler, and I was turning left along with another vehicle. He took it way wide, and so I made sure to stay well behind him because I was unsure of what he was going to do. At this point the Jeep starts beeping at me loudly like I'm going to be squished. I looked around, and didn't see anything. I have no idea what triggered it. Maybe something about the angle. The other guy was so far wide, and was coming back that it looked weird.
Aside from the not knowing I'm mostly happy with FCW stuff on the various vehicles I have. it's not obtrusive enough to turn off, and it's also extremely beneficial as a second set of eyes.
LDW I find is REALLY obtrusive, and annoying. On my AP1 Model S I almost immediately turned it off. On the Model 3 I believe it even defaults to being off or maybe I'm not remembering correctly as that seems odd. I have another vehicle with it, and on it I leave it on. I do because the use cases are completely different. It's a massive 4x4 Sprinter Van that I use for road trips. So I'm more concerned with zoning off. Not like I tend to zone off, but you never know. It's also really easy to temporarily turn off as there is button for it. On my moms Subaru I turn off LDW
Parking Sensors - They're awful in pretty much every vehicle I've ever owned/used. The problem is ALL THE BEEPING. It's really a UX issue of needing to leave people alone unless something is actually getting close to hitting. But, they'll start beeping well before.
AEB - Haven't had much issue with it in any of the vehicles I've owned. It's supposed to be last resort kind of thing, and I'm a little concerned about the desire to have these things be more because that increases the chance of false events.
The new Emergency Lane Departure System from Tesla - I experienced one false event, and turned it off. I was glad that they changed the setting so it doesn't automatically turn back on on the next start up. The issue with this it's an active safety thing that hasn't been all that well tested.