Not necessarily!
Used effectively, the conditional-skip style of the 16F84 (and 75P008, and...) does not produce code that is inherently any larger or smaller than using the conditional-jump style of the 8051 et al

Consider the following:

By combining a Skip instruction and a Goto, you effectively have an if...then...else structure; to implement the same thing on an 8052, you would also have to combine a conditional jump and an unconditional jump.

All of the 8051 conditional jumps are at least 2 bytes - so that's at least 2 8051 instruction words per conditional branch;
All of the 16f84 instructions are 1 word, so you can always achieve a conditional jump in 2 16f84 instruction words.

Sometimes, just skipping an instruction will be exactly what you want to do - so a 16f84 single-word skip instruction will use less code than an 8051's conditional jump over an instruction.



Before I get my 8052.com registration revoked, please note that I am not trying to say that a 16F84 is better than an 8052.
I am just pointing out that the statement "the code will be long [because you have to use skips instead of conditional jumps]" is a complete non-sequitur