Rover,
It is not progress to run rail cars or superhighways all over the countryside in a politically popular, but futile, attempt to make politicians look like they are doing something.
The quality of life availiable in a mega-city and the environmental problems that go along with forcing (economically) people to live in a crowded, dirty, and unsafe environment is IMO not good for people generally.
No, I wouldn't rather see the cities "gridlocked". I would like to have a politician acknowledge that the problems of excessive size are practically insurmountable and have them (the politicians) present policies that would disperse them a bit. It would also decrease the amount of transportation required, relieve some pollution problems, and allow more quality time (time not required for basic employment)
Mass transit only excerbates the basic problem of overcrowding. It allows managers, factory operators, and government bureaucracies to place their jobs where the products are cheapest (or pork barrelled the most)
and count on the taxpayers to build the roads and bridges so that there will be enough warm bodies at the location so that operations can be profitable.
For instance, If it was uneconomic for you to commute to Seattle then you wouldn't do it. Then the manufacturer would be forced to move the jobs a little closer to employees. This would tend to decentralize the cities or the manufacturing which would probably be a good thing.
Whoever you are working for in Seattle must pay enough to compensate you for the time spent commuting. By subsidizing your commute the taxpayer is enabling your employer to pay you less than he would have to otherwise. This causes distortions in the local economies. All of them.
Seattle suffers from crowding, pollution, traffic problems and others. Portland suffers by exporting the job which you would otherwise take closer to home to Seattle thus reducing Portlands tax base and abilities to attract industries (jobs).
Southern California already takes much of the water that naturally belongs to the people or taxpayers of other reigions. The subsidized water makes it difficult to profitably grow alfalfa, lettuce, and many truck crops elsewhere in the country. The pouring of water into the Imperial Valley at taxpayer expense has driven vegetable farming, grass farming (hay and alfalfa pellets primarily), and Dairy Farms out of most of Appalachia, and is raising difficulties in your high desert let alone Wisconsin, Florida,and most of the deep south. The higher market value of real estate with subsidized water takes investment funds away from other places which could possibly be developed except for the economic distortions caused by subsidized water.
Subsidies, whether for mass transit, manufacturing, or irrigation projects, ALWAYS cause distortions, which ALWAYS result in inefficiencies, which ALWAYS requires more government supervision, which ALWAYS requires more subsidies, which ALWAYS results in a lowered quality of life for humans.
You realize that the words "Portland" and "Seattle" are being used for illustration only (poetic license) I have no idea of what their particular problems are but I am fairly well convinced that subsidized transit won't help their citizens. It will help only their professional politicians (bureaucratic managers).
(There are very few times when a discussion of economics can use the word "always". I am pleased to be able to here.