i'm sure you've sorted the height out between the 20-22 now you've seen tv calcaultor.
24" is not huge and immersive though, its just a monitor, you'll get used to it and it will seem small before long. people used to use 14" monitors after all, remember that first jump to 15"..omg its bigger..19" omg its biigger...20" ..21"... its omg its bigger-> meh in short order. Its not like sitting close to a tv because lcd has almost no eye strain, and the pixel density is high enough that its just more screen space, like a bigger desk, you have more space to work with. with anything smaller than a 24" using multiple windows on a screen is too cramped. until24" you can't really do multitasking windows in multi window on the same screen style well, such as documents side to side. and as you've noticed you probably maximize every window because thats the only way to get enough space on a small screen. like a newspaper, its not too big to have a big two page layout, it just lets your eyes scan/browse more information at a time. Its not until 30" do you start reaching the practical limits of desktop size. for office work 24-30" is optimal. Anything less is limiting unless you go with multimonitors, and your setup pretty much denies you that option.