Yes, they are. But national crises seem to be a uniting force to get amendments passed. Civil war bore 3 or 4 amendments. The robber barons of the late 19th and early 20th centuries brought a couple, as did the Great Depression. Civil rights era gave us a couple.

I don't think that's really accurate. All the modern Amendments have dealt with largely procedural issues, rather than any significant matters upon which there were substantive political disagreements at the time. There hasn't really been a "substantive" Amendment to the Constitution since the repeal of Prohibition back in the 1930's - all of the other Amendments dealt with more procedural aspects of the government, such as the 22nd Amendment, giving DC the right to vote in Presidential elections, formalizing the SCOTUS ban on poll taxes, limiting congressional pay raises, etc. These weren't trivial changes, but neither were they especially consequential. They certainly didn't cross any major political fault lines or involve revisiting core principles of the government.

Arguably the last "Constitutional Moment" we had was the series of Amendments that arose from the Progressive Movement of the early 20th Century - authorizing the income tax, direct election of Senators, and women's suffrage. Oh, and Prohibition to begin with. But that was a century ago.

When thinking of Constitutional Amendments in the modern era, it would have to be on a subject that both Republicans and Democrats agree on. Hard to think of anything that meets the bill....