Actually the “filibuster” is by definition quite undemocratic.
The Constitution, in establishing all three branches of government, originally only provided for democratic election of the House (which, along with the Senate, actually has the ability to refuse to seat elected members). The Senate was appointed by the states, the President was/is elected by the electoral college (which we just saw with the democrat silliness in November and December is not required to vote for the winner of the popular vote), and the SCOTUS is appointed by the President and confirmed by the Senate.
Just using that framework, out of the five procedures used to put people in the four offices (SCOTUS has two separate procedures), only one was democratic. Add in the fact that the House must face reelection every two years while Senators sit for six years, the founders appear to have deeply distrusted democracy. And with good reason - the mob is both fickle and stupid.
The constant push for democratizing the fedgov since the 17th Amendment is very dangerous from an historical perspective, even if I happen to like the fact that Justice Gorsuch will be on the court. Democracies devolve as the pols cater to the mob without any incentive to plan or act for the future or the common good of the country.