the one thing to keep in mind with ruler work-is you need a thicker ruler than your normal cutting rulers!
the rulers i have are about 3/8" thick
the rulers we use with our rotory cutters are too thin--if using a free motion (hopping foot) you are risking the foot hopping onto the ruler and breaking a needle- could cause lots of problems---so
as long as you have a thick enough ruler you can do it- it does take some practice---driving and holding the ruler- but if you have a pretty good (relationship) with your machine and the quilting process already---ruler work is just the next step to take
proper tools always make a job easier- and the thick rulers are the proper tools (to do a good job ---AND TO DO IT SAFELY!)