Everything. Anyone who wants an advantage, has been using various computer programs for over 50 years now.
You live in the world of Digital Overlords. The Viceroys create the architecture for just about everything. Everything in your life that uses a computer, has gone way beyond optimizing into the realm of code*, that codes the framework, for the optimization, whether it be for money, attention or just probing your reaction.
That is why professional have always done better. They use the latest tools in an ongoing warfare for dominance (alpha). Just look at Crypto. It went from coins, to arbitrage, to "Borrowing-Lending to feed the arbitrage, in a very short time, driven by using tools (algos). Meanwhile retailers are just Digital Serfs, loaning their coins for a few percentage points then getting wacked with 100% loss.
If you are still using 1990 tools, you are at a disadvantage. The only thing that can make you competitive are modern tools or a few decades of actual experience, or both.
* Soon it will all be Meta-coding in the 5th or 6th degree where you are coding the rules to guide the code how to learn to code. After that it will be coding Meta to the "Alphe-nought" degree".
