Ooh, missed this.
I went bent due to lower back injury, which flared up again in 1999/2000 and left me feeling very rough, also eating painkillers like smarties. Speedy was the answer, but there are downsides too. Here's my £0.02:
The weight thing hardly matters, as Kim has said. If you travel in any way loaded, commuting or touring is comparatively slow. You'll go like stink downhill.
Three wheels was right for me, as my back wouldn't do the hip angle to drop one foot on the floor without pain.
Rolling a trike in traffic - done that (T-boned by a numpty in a sheeple-carrier, it was that or go head-on into the opposing traffic). It's not recommended. Funnily enough, that's what caused me to start wearing full finger gloves, after leaving some of a fingertip embedded in the tarmac.
Space - I think the WTF-factor is the main cause of space, which still works for any recumbent (but for how long, if they become more common?). Secondary to that is that bikes look thin because their footprint is thin, and people ignore the handlebar width, with attendant consequences. Trikes look wide because their footprint is wide, and so people see them as wide. Just a theory.
One downside I discovered only after riding some years was that the recumbent position didn't help my posture. It seems that the core muscles don't get the constant tweaking that they get from riding an upright. Could just be me though, and may just apply to trikes.
Hope your recovery goes well.