The reason for the disillusion is clearly spelt out by political scientists and constitutional lawyers. The problem is that the discipline of political science is possibly the only one in which research into better ways is left to the lay fraternity. They seem more interested in becoming experts in how 'it' works and occasionally identifying the problem. The value of a person's vote may well, and does, vary as between people. But that in no way negates the value of a person's vote.
Participation is beneficial in both departments.
The trip to the polling booth is marked by a remarkably happy spirit among voters, even though knowing that the next person is probably voting adversely. That is the quite wonderful virtue of the ballot. It creates democracy. But government can never go further than the people. Only a caring people can create caring government - real democracy.