That very much depends on the route. Taking the Oldham Loop for instance, journey times between Pacers and trams will be markedly different. I wouldn't be happy living somewhere such as Shaw and Crompton, where once I could get a fast Pacer to Victoria but now having to settle for a tram calling at all stops on route. A lot of people I talked to on the last day of service were considering travelling to Rochdale to get the train from there.
As for the Harrogate and Penistone lines, well the Harrogate line is far too long for any sort of tram network, and the Penistone line again is the wrong sort of route. The only place I see for trams is inner-city areas.
I will agree with your first point (we've agreed on something regarding light rail at last

): in the few weeks after the Lop closed, morning trains to Victoria were leaving HUNDREDS behind at Mills Hill! Rochdale has also lost early trains into Manchester, especially on Sundays, though, since December, there has been a new, earlier train calling at all stations. I would assume residents of Shaw, Crompton, Milnrow, New Hey and Oldham will be disappointed at the loss of their fast, half-hourly train, even if it was a Pacer (150s also worked it, along with the occasional 156). Out of curiosity, have the released stock gone to strengthening Huddersfield/Rochdale-Victoria trains; Huddersfield definitely needs them for the amount of people using Greenfield!
I agree also that Harrogate and Penistone are not correct for tram-trains, but I have a few questions regarding them (this isn't paranoia, just curiosity

):
Does it involve any conversion of a line, i.e. lowering platforms etc?
Does it stop other trains from using the route?
Is it officially light rail, or like one of the old Pacer-Bus things made by British Leyland?
Is there any actual advantage to using them, other than maybe getting rid of 142s?
Thanks, and sorry if this is too off-topic.