I'll speak for myself, as I just finished developing a fully functional dapp on the Polygon blockchain. Transactions are usually confirmed <30s (not fantastic, but acceptable) and cost less than $0.0001 worth of gas each.
There are also other solutions which may work better for certain dapps. For example there is Arbitrum, which has much higher gas costs but instantaneous confirmation times. Regardless, the ecosystem is moving fast, improvements are always coming soon™ and new solutions are popping up all the time.
But what's right here, right now is already good enough to be usable.
>But I really don't like the idea that all (most?) DApps are based on Ethereum and require huge amounts of Gas to run. Can't we have DApps without Blockchain/Ethereum?
Previous generation dapps were mostly on Ethereum because it was the only real solution available. But the ecosystem is maturing, there are chains that consume so little gas it's effectively a negligible cost, and more and more dapps are making use of them. Not to mention that Eth 2.0 is coming soon™.
Nice work, and good luck.