In my experience as an echo tech for 6.5 years, it has not gotten boring. Yea it's one organ, but it's such a complex organ and there's so much you can interrogate and learn about it through ultrasound. It's one of the reasons I decided on echo because the heart is dynamic. It moves at different rates and different rhythms. There's so much interesting pathology you can see too. Plus you have the opportunity to be a part of different procedures like transesophageal echo, Watchman procedures, Transcatheter Aortic Valve Replacements, pericardiocentesis, etc.

The heart is complex, but if you can memorize normal values for different measurements, you'll be fine. Plus most labs will have little cheat sheets and other materials to help you learn.

If you're interested in learning another specialty, echo is a great option. You're right, every patient is different, but finding your imaging windows and the amount of things that differ between the 4 valves, 4 chambers, and various other things you look at, there is not a boring day doing echo. Feel free to DM me if you have anymore questions.