Without having been a fly on the walls where various conversations took place that were directed toward your case, it's really hard to tell. What degree or percentage of blockage, and which arteries were involved. If the anterior descending was one of the three, yeah, I could see them having some urgency and wanting you to get to see a surgical team, maybe even over the weekend. Also, there's the symptoms; what are we talking about? Severe and intractable angina, some dull radiating pain toward the armpits, shortness of breath........what?
I'm not suggesting you were wrong to refuse their advice. But I don't know enough to argue for you or against you. Did they agree that you wouldn't likely go under the knife until the middle of the week?