I did a long time ago. It was very low, could not see the sights which has always been a key part of cycling to me. And it was not something that you could take out on to the main roads.
You were just riding the wrong one. And whaddya mean, not take it out onto the main roads? I ride mine all over the place. I have a friend who lives in Brixton (has done for at least 20 years) and all that time has ridden all over London on a 'bent. They are SO comfortable.
I ride this:
http://bikefix.co.uk/spirit (without the fairing) and you are almost as high up as on an upright. If you were riding a low-slung racing 'bent then I'm not surprised you missed the view, and I probably wouldn't be comfortable that low in traffic myself, but look at the main recumbent page on the bikefix page
http://bikefix.co.uk/recumbents and you'll see a whole range of different bikes. On many of them your head is about the same height as if you were driving a car.
I'd love to have a go on a racing 'bent, I must say!