The French have a vacation period during February so you will likely see some lines particulary at the bottom of Grands Montes, Flegere and the Aiguille du Midi.
They can take a long time, particulary up the Midi.
They can take a long time at the Grands-Montets too. It took me about 45 minutes at 9:00AM on Tuesday (last week is one of the quietest weeks of the year) with a guide. Go early. Better yet, go with a guide.