We used our Phil & Ted Sport in November and when the second seat is under the main seat it has to be removed to fold the stoller.
Was it a hassle to fold? Yes. Was it easy moving the stroller down the aisle to the back of the bus as everyone was loading? No. But, for these small inconvieneces, which only happend about 4 times a day, it was well worth it to have MY stroller at the airport and in the parks.
I'm sure the Citymini is a great stroller, but I purchased my P&T for a reason and I didn't spend all that money on a stroller only to leave it at home when it would be most beneficial to use it!
I was never in anyones way, I never had trouble "fitting" on the bus with my family, either.
I will say that I also never did it alone - I always and H or another family member to help me get the little girls out (it was a double afterall) and on the bus safely while I managed with the stroller on my own. H has no clue how to work that beast, lol.
By the 2nd day we had the routine down pat -- which your co-riders will appreciate.
While waiting for the bus I made sure the basket was empty. When we saw the bus coming we took the girls out and removed the second seat. I was able to quickly fold the base when I got to the bus door and then I walked to the rear with both pieces. I used a "mommy hook" to secure the second seat to the base -- can you use something similar on the bug so that both hands hold the base?
Just make sure you start getting the stroller ready to fold BEFORE the bus arrives. It will save a lot of time - and stares