We used a weeride too , they do get in the way a little bit but you won't be riding in a mad way with your pride and joy in the seat.
The only problem we found was when we did the full 'Camel trail' in Cornwall 2 years ago. A 3 year old gets extremly floppy when tired/asleep and as the weeride sits the child quite upright they tend to fall forward. We ended up letting him lean forward onto the pad and made a pilllow with one spare top and tied him on with another.
Nowadays we have a tag-a-long that he loves and 2 weeks ago he got onto 2 wheels unaided 😀