Excessive and unnecessary appeals happen all the time and umpires do have complete control over it as they have the right to penalize players or captains, given they have been warned once.
Also when the captains do take review it doesn't take much time as they have only 15 secs to take a DRS call, problems come with the 3rd umpire cause sometimes in pressure moments they even take 2-3 mins.
Cricket umpires are easily one of the most controversial aspects of the game which is actually understandable since they are humans who make mistakes now and then.
What truly pisses me off is when they waste time checking stuff which is 100% unnecessary across all formats of the game(Mostly 3rd umpires). Their idiotic commentary on top of all that makes it worse.