"1 * 3 + 4 / 20 && foo" is unreadable. No one wants to memorize the order of operations for every language they use and have to figure it out in their head. Make life easier for the people who have to maintain that line of code you just wrote.
- Tim Bray
[1] http://www.tbray.org/ongoing/When/201x/2010/06/29/No-Default...
Maybe I'll eat my foot some day, but
(a == 1) && (b == 2)
(2 * 3) + 1
That is, there's a reason for whitespace around operators, after commas, extraneous newlines, etc. It makes the code easier to read and maintain. Now while I'm willing to admit that this whole area is largely aesthetic and personal, if you submitted a line of code to me that was just this without the parentheses:
> 2 * 3 + 1
I would reject the code review in a heartbeat. Part of making your code readable to others and less error-prone during maintenance is adding extraneous stuff to it that isn't necessary for the code to parse/compile/interpret.