Is it worth stepping into the world of Medium Format photography? (film or digital)

I didn't know where to place this thread/question, so hopefully I could get some assistance here. 
I was wondering if it is worth jumping into the world of Medium Format camera. I am an enthusiast who likes to experiment with different cameras and formats. I had a chance to shoot MF film (4x5 specifically) when I was in school, but have not had access to the equipment or a lab since then.
I would like to know where a could place to start would be. I don't mind shooting film if there is a photo lab which processes it well, or as long as I am able to process the film myself (does anyone know of a lab in the NYC area?)

If shooting digital, is it worth the workflow change? I noticed that some digital backs require the camera to be tethered for shooting. 
If so, what bodies are available that take both film and digital backs?
Thanks for the assistance!

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"In the Internet age, the bathroom is now the photography studio.In the film age, the bathroom was the developing lab.
And before the film age, I guess it was just the outhouse." - Anonymous