We aren't pleased, Naomi -- because even if, as you say, we aren't leaving, the thing is that we aren't staying in either. Remainers wanted to keep a seat at the table. We have abandoned that seat, and with it that voice in the EU to play our part in shaping it. That's a big loss -- no-one on the Remain side, therefore, can be happy with this outcome. It's not as bad as leaving entirely, but is many times worse than staying in properly.
Gina Miller's contribution, meanwhile, was merely to point out that the UK constitution forbade unilateral notification of Article 50. What spanner in the works did this seriously put in? If anything, it should have thrown Brexiteers a lifeline, because it could have given them the time they needed to properly plan for leaving. Instead, they were so busy screaming "enemies of the people!" and rushing for the door that they forgot about the need to prepare. So did Theresa May, of course, but she was egged on rather at the time, wasn't she? And not by Remainers, either...