Senate has two per state regardless - so states ranging from under 1 million to nearly 40 million. The electoral college is done more proportionally - California has 55 - but all states have a minimum of 3 votes, so it still isn't particularly proportional. House of Reps is more proportional, but still skews somewhat in favour of smaller states. Plus DC isn't a state so doesn't get any senators at all. None of its systems give equal weighting to all votes, but some of the systems are way out.
It's a system that was set up long before many of the current states even existed. What might have made some sense 200 years ago doesn't make so much sense today.