We use the light rail all the time. It used to be pretty much our only mode of transportation into the city because our apartment was 100 yards from the station. We'd bike to work, and take the MAX to Portland.

Now that we live in the country, we bike to work (as much as possible). The last time we went into Portland, we drove to the last stop on the light rail and then rode it into town. Once winter rolls in, we'll probably use a combo of biking and the rail to work when the weather is bad.

When I travel, I prefer to use the public transit system over renting a car if it's at all possible. It's soooo much easier than having to deal with parking and traffic in an unfamiliar city.