The echo is the largest portion of any cardiac examination for valve issues. Its results drive the questions about symptoms and provide a completely different perspective about the heart's state of health than the office exam can.
Most echo reports will list the normal value limits to compare against, although lately I've seen some stylized versions that are made to look like you're getting information, when large portions of the bread and butter of the test are simply left off the form. This would be acceptable if that was all of the information the caardiologist was getting, but it accounts for less than half of the measurements routinely produced by a standard echo.
At any rate, it gives you something solid to discuss with your cardio about whether you have an upcoming need for surgery, how your recovery is progressing, whether something you're feeling is likely to be a symptom from the valve issues or not, etc.
Without it, you're just showing up with nothing to discuss, and he'll likely just tell you what's convenient for him to tell. Some people want to know, some don't. If you do, get the results first. If you don't, you can let the cardio handle the decisions. I like to make my own life-altering decisions, so I would want to know ahead of time. I want to understand the context in which he's speaking, and make an informed judgement of my own.
Best wishes,