I guess Moffat could save a ton of money by just setting everything on modern day Earth like the previous era, but I like that the series is more exploration based now. Power of Three felt like a weird one-off whereas in 2006 that episode would have been the norm.
I think there's definitely something in this. I don't think Moffat is very conscious of his overspends. RTD seemed more in control of how to spread the money around more - the use of standing sets across more than one episode being one example when RTD's method was more cost effective than Moffat's. Things like constantly changing the TARDIS set to allegedly 'refresh' the look of the show cost money in terms of rebuilds, too. Just leave it the fuck alone, Steven!