We often trigger pipelines by entering a couple extra variables manually, for instance to tell it to start a certain type of deploy. That used to be a quick click and type, now I have to first select the pipeline from the pulldown (even while we only have one default pipeline) and then have to click Add to actually be able to enter those items. Very annoying. 
An update will be available soon that defaults to the single pipeline, so you won’t need to select it from the input. We’re also working on the ability to pre-populate pipeline parameters, eliminating the need to click Add to manually enter them. See here for more information.