I refuse to go anywhere near Nerja in the summer as it's impossible to park. Last year I was having to go for physio there and even the underground carpark was closed by the police as it was full. It was bedlam and my OH had to drop me off then go and park in Lidl and wait for me to finish. We know Nerja well and know of some of the places that visitors may not, but it's still is and always has (in the many years I've lived here) been a pain to park there. If you want to spend any time there then the paid for carparks like the one behind Carabeo or the underground can be expensive plus it is not always anywhere close to where I want to be. We only go into the underground when we know we shall only be half an hour.
The blue lines here in Torrox Costa have generally worked this summer and I've seen a fair few tickets handed out this year too. There is at least some turnaround and if you hang around for five minutes, often a car will leave. We rarely leave the house in August as it's so busy everywhere, but the parking restrictions have helped on the occasions we have had to venture out.