Are you able to disable auto-playing trailers, or are you just using the web interface or a smartphone/tablet that don't have this feature in the first place?

I have a recent AppleTV, which doesn't have any way to disable auto-playing trailers. Same for my previous STB (Roku). This is a somewhat new feature, so some older STBs and Smart TVs don't have it, but that's just because they can't be updated to the latest version of the Netflix app.

You can disable auto-play next episode across all interfaces and devices in the settings on netflix.com. I just wish there was an equivalent switch for trailers.

Never seen a function to disable trailers completely (my dumb tv is a large, wall-mounted 3rd computer monitor, so I'm using the web interface), but at least they don't play sound which would probably make me cancel my Netflix subscription.