Cadence builds are generally low stress workouts. You spend most of your time in Zone 1/2, with the short high cadence done at low power. So even though it hits your NM system, it’s different to an all out sprint workout. I also find them boring, and used to just skip them and run that day instead. But I found that I struggled with FTP-level efforts at ~95-100 RPM, and cadence builds were my one major gap in my consistency, so I started doing them (most of the time) with that motivation in mind. Did they help? Well, it was a period of improvement followed by all-time PRs on NM, AC and FTP metrics, and second best on MAP.
One alternative is to throw in a few spin ups at the end of a weekend Endurance+ ride, similar to how runners will sometimes add strides to the end of a long run.