Just my view. For arranger playing carrying pedals is a waste. BUT, for real playing they are great. No, the lines aren't as perfect or fancy as an arranger but that's what makes it real.
I've played pedals my whole career, many years and gigs on a modified B3.Had a custom bass unit installed just like Felix of the Rascals had. Gave you sustain on the pedals, you could switch it to the lower manuel and had a seperate 1/4" output to go into a bass amp instead of pushing the leslie too hard. It ROCKED! When in college I took a semester of classical organ to improve my chops and sometimes had to play pedals with two feet. Balancing on the bench was the hardest part.
I still have two sets of PK5's and sometimes fool around on my G1000 with a set. Yes, they are too short for true heel/toe playing but by adding sustain to the sound you can just tap them with your toe. Works fine.
Until recently I had a Blues/Jazz trio I used them with. RH on a Hammond XK3 and LH comped chords on a Roland piano while doing the bass on the pedals. After a while you don't have to think too much about your foot.
I recnetly sold a B3 to a guy in the Netherlands who heard Rhoda Scott play. I explained to do the bass the way she does (in high heels no less) you need a Trek II String Bass unit installed. He ordered that too. Money was no object!
I still have a mint 58 B3 with a Trek II bass unit installed. Hardly play it anymore. For sale if anyone is interested.
The straight jazz guys do as Fran said. LH bass lines on the lower manuel and just tap a note on the pedals for added ooomph. Sometimes just any old note and sometimes just a few to mirror the LH.
Things have changed and I miss the "old" style of playing it all.
Bill NJ