There are plenty of "synthetic" flavours - Takis, Twinkies, and bubblegum drinks spring to mind.

There are also a wide variety of textures that are heavily industrialised. If you go to some fine dining restaurants, you'll find smells and colours which you simply cannot replicate at home - let alone make from scratch.

Most synthetic meat and fish is really just a flavour carrier for whatever sauce people like. I've had imitation chicken, shrimp, beef, crab, etc. They all taste great - but that's mostly because the sauces are the same as their meaty counterparts.