If it has been a long time since you have flown into busy airspace or a busy airport, it’s natural to feel nervous about the challenge ahead. The good news is, controllers working a location with a lot of traffic use the same standard phrases as controllers working an area of light traffic. The only difference between “busy” and “light traffic” is the interval between radio transmissions. In busy airspace, the interval between transmissions is very short.
The pacing on the radio in a busy traffic pattern or a busy section of airspace requires that you focus more attention on the radio to avoid missing your call sign when it is spoken by ATC. Take a look at these articles on the topic.