I’ve been to Lisbon before - and also paid over the odds for a taxi - it’s surprising how things don’t change (or maybe not). Anyway everyone has to make a living, and sometimes the driver is really cool and gives you some inside tips and cultural perspective. So that’s ok.
But hey - if you want to save a few pennies, then I’d always suggest figuring out how to get from the airport to wherever you lay your hat (and therefore is home) before you depart - even if it’s a shuttle bus to the city center (from where taxi’s will be cheaper) and then you can sit in silence with all the other tourists.
Lisbon was fun, with plenty of twisty turny cobbled streets, decaying buildings, odd museums, sexy wine, great food - and cats - and marks possibly the first time I’ve seen a train line in the middle of a road.