Chris - This photo really captures all the different things people do in the MK hub! And you might eventually convert me to full frame ( I assume that this is FF.)
Kathy, I went from APS-C (Sony NEX-7) to Full Frame last year (Sony A7r2). Here's my lists of pros and cons of FF (that mattered to me);
Pros
Better image quality that becomes more pronounced as you go higher up in ISO.
Better depth of field range. An f/4 lens looks like an f/2.8 in crop.
My A7r2 has a 42mp sensor and allows me to shoot in crop mode with 18-20mp (but that is more specific to the camera).
Cons
Generally more expensive - camera and lenses.
Bigger/heavier
I am very interested in seeing the next generation of APS-C cameras. Fuji's new one is pretty amazing and I know Sony will likely counter by year's end.
I feel you can get 90% of the IQ of a FF with a cropped camera. That extra 10% costs a lot of money and subtracts convenience. For a pro (I've done a few paid portraits but photography is far from my full time job) it's worthwhile.
If you like shooting wide open (which I do) it may be worth it. If you like printing your photos bigger than an 8X10 it's probably worth it.
If you photos are mostly for memories and posting online - not sure it is worth it, unless you really have to scratch that FF itch. I would suggest renting a FF camera and lens first.
I love my A7r2 but I still use my NEX-7 especially for quick trips and such. I've also started using my phone more (Google Pixel 2). For the amateur/enthusiast I think FF is luxury that is nice to have but not a "must have".
And yes, that was shot on my FF A7r2 with the excellent Zeiss Batis 18mm 2.8 lens. That lens runs $1,500. I rented it for our last Disney trip.