I didn't hesitate to purchase the 16" model coming from a 2017 15" MBP. I am a graphic designer and I love the additional screen real estate (previous MBP before the 15" was a 13" MBP). I'm 39 and maybe my eyesight isn't what it used to be but I get really fatigued looking at a 13" screen for too long. I do 80-90% of my work connected to two 27" monitors at my desk, but portability is also important to me as well.
All of that said, the weight of the new 16" model seems to be the same (or close enough that I don't care) as my 2017 15" MBP. I was thrilled to see the HDMI and SD card slots return along with magsafe as well as 21 hour battery life. THAT'S RIGHT 21 HOUR BATTERY LIFE! Okay, maybe for my unique usage it may only be 10-15 hours of battery life but that is still incredible to me. This computer is a TAD on the chunky side but it is still a beautifully designed machine. The thickness doesn't seem excessive to me and I probably would have been fine with it being even thicker or heavier in order to get all of the ports, incredible performance and 21 HOUR BATTERY LIFE. This computer is a dream machine to me and if you are used to using 13" laptops then maybe you should see one in person before purchasing but if you have used the 15-16" MBP's of the past, you will be pleasantly surprised.