For me, "begin" and "end" are actually much more comfortable to type, because I don't have too move my hands for that, I can stay pretty much on the home row. Curly Braces are way too far on the right top to do that and then you either have to use you weak fingers or move quite a bit.

(Granted I am touch typing and also using Colemak layout, so rarely ever move my hands. For people that hunt and pek, I believe curly braces are easier to type.)

I don't think there is much practical difference between curly-braced vs keyboard based syntax. Both are similarly easy to read, especially with syntax highlighting. After a while, your brain will automatically parse "begin" and "end" as a symbol, same as curly braces, so you won't notice the "noise".

As for the pros and cons:

Pascal style syntax is slightly better for new people learning to program. Learning how to even type those weird curly braces and understanding the difference between all the styles of braces just takes focus away from actually learning how to program.

Curly braced C-style syntax is better for people that already know how to program because everyone is already familiar with at least one curly braced language.