Judgement should guide you. Certainly adequate for who will be using it. Don't rule out your own personal whim or context of the region or garden style. Guidelines should be considered when they are available, but considered does not necessarilly mean that you'll follow them.

I'll bet you have an adequate to good eye for proportion and scale, madtripper, if not better. Envision the path with plants planted at and growing over the edge in spots or along the whole length. The more path, the less weeds. :)

a path needs to be wide enough to function, - say to be able to roll a garden cart, or a wheel barrow, or the trash cans down it.

yours manages that handily  and when you say Â4-5 feet I take it you mean that the path has an organic (ie not ruler-straight) layout, so a person coming down the path can step out of your way without having to stand on the hostas, which is a nice feature.

The path, I think, looks Âfat because the space is long and fairly narrow  and itÂs bare.

Nothing has crept over the corners yet, thereÂs no hensbane colonizing things, no striped hostas leaning over the stones, no ferns leaning over the hostasÂ

I would say that you have planned well, in leaving humans a fair swath down the center of what will be a dense little jungle in a few short years  it will save you from having to keep pushing the plants back ever year, lest the overrun things.

And trust me  they will.