With my son we did minimal baby proofing in the first place. The extent of what we did:
- medicines and cleaning products were kept up in high cabinets (which
they were anyway, but we just took care not to leave them out / in
- we put a stair gate at the top of the stairs
- we had a cupboard door lock on the large pantry-style food cupboard in the kitchen. In hindsight I would not have bothered with this.
- we had those little plug socket blocker things. In hindsight I would not have done this because I've now found out that (with UK sockets at least) they can actually make the socket MORE dangerous.
When he was 3 we moved house and we didn't bother with any baby proofing at all in the new house.
My daughter is now 16 months and we've followed the same principles - minimal changes to the house. I would far rather teach her not to touch certain things so that if I forget to latch the cabinet lock or we visit someone else's non-baby-proofed house, it's not a problem. Again the stair gate is the only significant baby proofing, and we'll take that down once she's reliable going down the stairs forwards on her own, some where between 2 and 3.
The only other thing I would baby proof if I had it would be a pond or swimming pool, in which case I would keep the protection up for a bit longer.