You know if you put a planter in between the front doors then the neighbour will resent you, and the postie will hate you. Everyone will just clamber over the planters so as not to have to walk back down the central footpath, around two parked cars and up the side path then back again.
Seriously, all this talk about quiet enjoyment and private land! Humans need to learn to live together. You share common footpaths. The houses may be set back from the road, but the parking spaces are directly in front of the house separated only by a footpath not a 6ft garden with stone wall. You will see people. Folk will use the footpath when you don't know them.
The only private space you own is the house and fenced in back garden. You have a dedicated parking space in public land. The footpath is not private, it is there to facilitate access to properties.
Part of estate design is to encourage community development, so you can form a sense of community by bumping into neighbours in public spaces. A lot of footpaths aren't formally fixed (eg with railings or immovable barriers between houses) because humans walk along desire lines (eg the sort cuts and worn paths you see in parks or grassy common areas) and preventing that from happening can cause issues with feelings of being hemmed in and controlled.
By holding stubbornly firm to the red line on the footpath in front of your house, you are in danger of creating problems with your neighbour.
Stop parking your car right up to the bushes in front of your window. Leave some space so nobody has to squeeze and just unclench for your own sake.