Is there any benefit in doing an indoor cycling class when you have access to a stationary bike at home?

What gets easier as you continue to ride a stationary bike is that you build strength and stamina, you grow in confidence and you get used to the riding position which enables you then to ride for longer and at higher intensities - in this sense, yes, it gets easier. So if you’re starting out with a stationary bike, it’s best just to do as much as you enjoy, ride with great tunes, use something like Intelligent Cycling to provide focus and effective workouts - enjoy the process so you build a habit, and it’s the habit that gets you the results you want.
What doesn’t get easier is the intensity. As you get fitter and stronger, you just add more resistance. This means you can work harder, get better results, burn more calories etc in the same length of time. No, it’s never easy - you just get stronger. Enjoy!