Short answer

Instead of =TRANSPOSE(TRANSPOSE(A1:A30)) consider to use ={A1:A30} as it's shorter.

Long answer

An alternative to ARRAYFORMULA is the use of embedded arrays also named

• inline arrays
• literal arrays
• array parameters
• "your own arrays"

Example of embedded array of constants

={"A","B";1,2}

={A1:B2;D1:E2;G1:H2}

Example of embedded array of non-adjacent ranges.

It's worth to say that for spreadsheets with regional settings that use:

• . as the decimal separator should use , as the column delimiter
• , as the decimal separator should use \ as the column delimiter

In both cases use ; as the row delimiter.

Reference

Using arrays in Google Sheets - Docs editors Help

You can use ARRAYFORMULA to do this. Then you reference the column as eg B1:B ( note that there is no row number for the second part).

So if you want every cell in column A to be double of column B, you would put this in cell A1...

= ARRAYFORMULA (B1:B * 2)

You might want to throw in an if statement to check for non numeric values as well.