I think inspiration does not come TV programmes alone, unless of course you are unable to get out and about. But if you can, I take inspiration from my local environment - other gardens, parks, even the council's hanging baskets strangely. My plans this year is to do a bit of traveling with the kids, not forgetting my camera of course and a sketch book.
I'm itching to get into the garden but the conditions are not quite right, so in the meantime lots of reading, internet, researching painters, photographers, stately homes etc
After I'd watched GW one thing stuck me, it was one of the best beginners introduction to gardening without saying heres an A-Z. Joe's design was fab, it's so hard to put down on paper a vision and even harder to realise it, in the physical sense. But if you did have the "average size " box garden which seems to be norm on new builds, you really could have planted this up exactly how he designed it.
One thing I have to remember, even tho the programme didn't fully inspire me to the point where I was leaping off the sofa. It may have inspired some one else - which is cool because I'll checkout other avenues of inspirational ideas. I love to research.