While using rudder as a newbie isn't really necessary, it is a skill that will make you a better pilot in the future. If you have no problem flying a plane, and are at the point where everything is fairly natural, then by all means start using it. However, if you are still learning, then it can be a problem to 'throw something else into the mix'.

I use rudder all the time. I use it to help coordinate turns on some planes (helps keep the tail level in banks). I also use it to straighten out uplines and vertical flight. When you get good with it, it also helps offset wind, thermals, and the other things that don't help your plane fly straight.

I've been flying the better part of 6 years, but don't recall really using the rudder until after my 1st year. When I did start using it, I practiced side slipping and crabbing into the wind. That was very helpful in the rudder learning curve. Throw in some rudder, and try to keep the plane level by adding opposite aileron. Get good with the rudder, and pretty soon it becomes second nature - you won't even have to tell your hands to do it.

Rudder input varies greatly from plane to plane. A trainer needs almost zero rudder, whereas an Extra might need rudder input all the time.