Use 'by here' to stress that something is very close to the speaker's current location. Don't worry about parking; there's a lot just by here.
Pro Tip 2/3
Imply Walking Distance
'By here' often implies that you can easily walk to the mentioned place from your current location. The cafe is close by here; it's only a five-minute walk.
Pro Tip 3/3
Clarify Direction
Combine 'by here' with gestures to help someone understand exactly where something is. The restroom is right by here—just over there, behind that door.