One often overlooked function, especially by novices, is the TRANSPOSE function. It allows you to flip the orientation of a range or array from horizontal to vertical, or vice versa. This can come in handy when you need to reorganize data or perform calculations on rows as if they were columns.

Another underutilized function is the INDEX function. It allows you to retrieve a value from an array or range based on a specific row and column number. This function is particularly handy when working with large datasets and you need to quickly retrieve specific values without using complex formulas.

Lastly, the TEXTJOIN function is not as well-known as it should be. It enables you to concatenate the values of multiple cells or ranges, with the option to specify a delimiter. This function is extremely useful when you need to combine data from different cells into a single cell, especially when dealing with large datasets.

One powerful Excel function that is often overlooked is the INDIRECT function. It allows you to create dynamic references to cells, ranges, or even entire sheets based on the contents of a cell. This can be especially useful when dealing with large datasets or when creating dynamic reports.

The AGGREGATE function is another hidden gem in Excel. It takes a range of values and performs various mathematical operations on them, such as sum, average, maximum, minimum, etc. The true power of this function lies in the ability to ignore errors and hidden values, making it ideal for data cleaning and analysis.