How much this law making interferes with democracy depends on how easy it is for the legislature to legislate. Judicial review of the lawfulness of administrative action essentially involves the same power of statutory interpretation with the same potential for legislative correction. Most of the nations of the world that do not have successful constitutional courts are not democracies. Indeed, no state without considerable claims to democracy has successful judicial review. These facts are clues to the obvious.
Constitutional government is limited government.
In the real world we do not encounter nondemocratic limited governments although we encounter many shades of more or less democratic, more or less constitutional governments. So there is some affinity between democracy and constitutionalism. Unlike the one or the few, the people must believe either that they cannot or ought not engage in unlimited government of themselves. Successful constitutional courts essentially engage in two rather different sorts of jobs. One is to referee boundary disputes between parts of government in constitutional systems that divide power among parts of government.