It is not clear the desire to stand in line to have a snack , but it is possible that it is very tasty there) without queuing, you can go in and take hot or cold chocolate with you (cold is wonderful in summer)
The toilet is on the second floor with a window , by the way , there are always tables on the second floor , you can relax with a glass with yourself ) and walk around the Tuileries garden
The most delicious eclairs in the world. But, of course, you have to take it away. Standing in a live queue for an hour or two to sit inside is doubtful