Originally Posted by violist
Haven't taken the RER in a long time, as both times I thought of it in the '00s there was a huge long line for the shuttle that looked as though enduring it would take longer than the ride itself. I took the AF bus to the Arc de Triomphe instead.
Depends on whether you come in at T1 or T2. T1, you need the bus. T2, if you don't have a lot of bags or a condition that makes walking a problem, you can walk to it. Not only do you avoid the lines, it can save time compared to waiting for the next bus even if there's no line. In late April a walk outside will probably be very pleasant.